Dulay (pronounced doo-leh) (also Dulai or Duley) is one of the many last names of early Jatt tribes that played an important historical role in Sikh history. Dulay is a clan of the Jat people originating from the Punjab state of India. It is also a prominent clan in the Philippines where Dulay is spelled as Dula in alibata, the pre-historic Filipino native alphabet, which explains the fact that the Dulay from England became Dula when it reached the Philippines during the pre-Hispanic time. When the Bolkiah Family of Brunei and Manila married a Dulay from England, the resulting marriages started the Dula lineage of Lakan Dula of the Kingdom of Manila. This foreign bloodline and connections also explains why the ancient Tagalog dialect has few Jatt-Hindu sounding words and seemingly old English derivatives because of several exchanges of secret communications between the Dula/Dulay of the Kingdom of Manila and Duleh of the Jatt people of India and Dulay of England.
Lakan Dula was born on December 16, 1503 A.D and died on March 21, 1589 A.D. He was the last King of Manila before the kingdom was totally subjugated by the Spaniards and his descendants were forced to do self exile to escape the bloody Hispanic persecution by settling in far flung areas within the sea and river routes.
There is one theory that says that Dulay is a Filipino ethnic name. It contradicts the prevailing internationally accepted theory that Britain somehow arrived before Spain to marry into the Dula family. The theory simply says that Dulay is simply Dula y Goiti, not a fairytale based in Britain. The truth is that to conceal the name Dula from Spanish persecution, David Dula y Goiti became David Dulay, from which the Dulays had descended. The fact is that Britain was in Manila for two years during the 1700's, not before, and had no real influence over the country. Spain did. So, the story that Dulay originated in two places is false. Dulay is not British, but Filipino and Spanish. That is well documented. Any other explanation that somehow Dula remained Dula and became Dulay through Britain and David Dula y Goiti is a contradiction. The origins can't be both. There was no evidence to support British origins of Dula, and there were no known British subjects in the Philippines prior to Lakan Dula.
But somehow, a second theory coming from the Royals of England says that British records state that Dulay bloodline and surname came from Robert d'Ouilli. There were only 243 taxable houses in the City of Oxford in 1086. Robert d'Ouilli (Doyly) held 61 manors in Oxford. He was Oxford's most powerful Norman magnate. Oxford was also known as Hokenorton or Hooknorton. He, Robert, was granted much of the county of Oxford by Duke William of Normandy for his assistance at the Battle of Hastings. Robert was Constable of Oxford. Robert had previously built built Wallingford Castle, completed in 1071. He held 61 manors in Oxfordshire. "He was so powerful a man no one durst oppose him" He was from Ouilly-le-Basset, near Falaise in Normandy. His sworn brother-in-arms, Roger d'Ivri or Ivry and he were both at Hastings with Duke William of Normandy in 1066. Between them and Bishop Odo of Bayeux, half brother of Duke William of Normandy, they held most of the whole county of Oxfordshire..The Dulay bloodline and surname eventually became Duleh when it intermarried with the Jatt royal family in India and Dula in Philippines when it intermarried with the pre Hispanic nobility based in Manila, because Dulay is spelled as Dula in alibata, the pre - Hispanic Filipino alphabet. The Dula surname was later changed back to Dulay by the latter descendants, partly to hide from Spanish prosecution but more on political statement as a re connection with it's British roots as a symbol of struggle against the oppressive Spanish regime. In the history books, the one who changed his name from Dula to Dulay was David Dula y Goiti, the eldest son of Batang Dula, who is the heir apparent and eldest son of Lakan Banao Dula, the last King of Tondo.
Obviously, more research is needed on this part of the Philippine history.
Although Dulays reside worldwide (with majorities outside of India in the United Kingdom, Philippines, Canada and the United States of America) many still live in the Dulay villages and towns in India, Begampur, Mehsampur,Sangatpur Partabpura - A settlement just outside of Jallandhar
From the historical accounts of the old folks of the clan, notably, the late Candawid Barangay Captain Macario Dulay; David Dulay is a wealthy Tagalog with several wives and children. The children from the first wife carry the surname Dulay to hide them from the Spanish persecutions. The children from the second wife used the surname Dula to reconnect to their Lakan Dula heritage. The children from his other wives used the surnames of their mothers. Some younger children from the first wife settled in Laoang town and made good in arrastre business and another younger brother joined a Spanish shipping crew to Manila and fell in love with a pretty native from from what is now known as Samara (from Samar), Aringay in the Northern Philippines where they later settled and raise a big family, but their eldest brother remained in Candawid, Isla de Batag, running the coconut plantation with uninterrupted lineage of his first born descendants down to several different generations of Petre,Doroteo, Elpidio, and Ceferino; until Ceferino married a girl from a Sephardi Jewish Mendoza family and surprisingly decided to go back to their ancestral homeland in Tondo and raised a big family. Later in his life, he uprooted his family in Tondo and together with some relatives, settled in Marikina Valley. They are now known as the "Angkan ng Dulay dito sa Lambak ng Marikina at Hilagang Samar".
The Ancestors of David Dulay (David Dula y Goiti) are as follows - Batang Dula: Father of David Dula y Goiti,Son of Lakan Dula and Mutya,Brother of Magat Salamat, Felipe Salonga, Dionisio Capulong;Lakan Dula (1503–1589): David's grandfather, Husband of Mutya, Son of Rajah Sulaiman I and Ysmeria Dulay, Father of Batang Dula, Magat Salamat, Felipe Salonga, Dionisio Capulong;Mutya: David's grandmother, Wife of Lakan Dula, Mother of Batang Dula, Felipe Salonga, Magat Salamat, Dionisio Capulong;Rajah Sulaiman I: David's great grandfather, Son of Rajah Lontok and Dayang Kalangitan, Husband of Ysmeria Doylly, Father of Lakan Dula and Rajah Sulaiman II,, Brother of Dayang Panginoan, Dayang Lahat and Gat Kahiya;Ysmeria Dulay: David's great grandmother, Wife of Rajah Sulaiman I, Mother of Lakan Dula and Rajah Sulaiman II;Rajah Lontok: David's second great grandfather, Son of Sultan Bolkiah and Lela Mechanai, Husband of Dayang Kalangitan, Father of Dayang Panginoan, Dayang Lahat, Rajah Sulaiman I and Gat Kahiya, Brother of Rajah Gappandan;Dayang Kalangitan: David's second great grandmother, Wife of Rajah Lontok,Mother of Dayang Panginoan, Dayang Lahat, Rajah Sulaiman I and Gat Kahiya;Sultan Bolkiah: David's third great grandfather, Son of Sultan Sulaiman, Husband of Lela Mechanai, Father of Rajah Lontok and Rajah Gappandan; Lela Mechanai: David's third great grandmother, Daughter of Sultan Amir Ul-Ombra, Wife of Sultan Bolkiah, Mother of Rajah Lontok and Rajah Gappandan; Rajah Gambang: David's third great grandfather, Father of Dayang Kalangitan; Sultan Sulaiman: David's fourth great grandfather, Father of Sultan Bolkiah; Sultan Amir Ul-Ombra: David's fourth great grandfather, Father of Lela Mechanai; Rajah Alon: David's fifth great grandfather, Son of Lakan Timamanukum; Lakan Timamanukum: David's 6th great grandfather, Father of Rajah Alon.
The history of Isla de Batag, Laoang, Northern Samar is colored with the arrivals of the Jewish, Spanish, Chinese and American adventurers who later intermarried with the descendants of David Dulay. The Isla de Batag, or its old name Isla de Batang, which is named after the eldest son of Lakan Dula, Batang Dula, is a strategic spot for settlers and up to now is a home of a lighthouse guiding the ships in the Pacific Ocean, being the first island that ships going to the old Kingdom of Manila would see or deck after a long trip in the Pacific Ocean; and just adjacent to Palapag, the shipping repair station during the Galleon Trade; and Catubig, the old provincial Spanish capital. One of the Jewish families who prospered in the island through the intermarriage with the descendants of David Dulay is the Mendoza Family, who are Sephardi Jews from Spain.The dialect spoken in the island is a Waray with some Jewish sounding words. Some of the relatives of the Mendoza family in the United States are up to now attending Jewish congregations. This explains the fact that the present leaders of the "Angkan ng Dulay dito sa Lambak ng Marikina at Hilagang Samar" have a Jewish bloodline. The provincial name, Samar, is itself Jewish in origin, which somewhat attest to the strong presence of the Sephardi Jews in the area.
The Dulay surname is generally thought to derive from a place name, perhaps Pont Doylly, or Duilly in Normandy. Spelling variations of this family name include: Doyley, D'Oyley, Doyle, D'Oyle, Doylee, Doley, Dulaey, Dulaye, Duley, Duley, Duly, Duely, Dueley, Ollie, Oyler, Oylie, D'Oyly, Olley, Oulley, Oullie, Ollie, Owley, Oyly, Oilli, Oiley, L'Oyle and many more. First found in Oxfordshire where they held a family seat as Lords of the Manor. After the Battle of Hastings in 1066, William, Duke of Normandy, having prevailed over King Harold, granted most of Britain to his many victorious Barons. It was not uncommon to find a Baron, or a Bishop, with 60 or more Lordships scattered throughout the country. These he gave to his sons, nephews and other junior lines of his family and they became known ookie/as under-tenants. They adopted the Norman system of surnames which identified the under-tenant with his holdings so as to distinguish him from the senior stem of the family. After many rebellious wars between his Barons, Duke William, commissioned a census of all England to determine in 1086, settling once and for all, who held which land. He called the census the Domesday Book, indicating that those holders registered would hold the land until the end of time. Hence, conjecturally, the surname is descended from the tenant of the lands of Eynsham held by Columban, a Norman noble as under tenant of the Bishop of Lincoln who was recorded in the Domesday Book census of 1086. His overlord was Robert d'Ouilli.
Recorded as Dealey, Deeley, Deelay, Delaye, Duley, Dulae, Dulaye, Dulay, Delay, Dealy and possibly others, this was always thought to be an Irish surname. If so it is derived from the pre 10th century Gaelic surname O' Duibhghiolla, the prefix O' meaning "male descendant of", with dubh, dark haired or dark skinned, and giolla, a boy or lad. The vast majority of Irish surnames were originally nicknames given to the first chief of the clan, and he was presumably significantly dark haired or dark complexioned or both. It is said that the clan originated in County Galway, whilst over the water in England there are a large number of nameholders particularly in the city of Birmingham. However the surname is well recorded in England in Elizabethan times, and we now believe that the origin can be either Irish as shown, or for many nameholders French. If the latter, it is from the surname 'de Laye', as shown in the recording of David de Laye at St Martins in the Field, Westminster, in 1569. Other examples of recordings include John Delaye who married Elisabeth Boner at St Bartholomew the Less, on November 24, 1602, and William Dealey who was christened at St. Andrew's Holborn, in the city of London on December 11, 1626. In Ireland itself where most early registers and records were destroyed by the IRA in 1922, we have the recording of Eleanor, the daughter of Michael and Eleanor MacDaniel Deeley, who was christened at St. Mary's church, Limerick, on August 3, 1780. Surnames became necessary when governments introduced personal taxation. In England this was known as Poll Tax. Throughout the centuries, surnames in every country have continued to "develop" often leading to astonishing variants of the original spelling. 
The Descendants of Lakan Dula of Tondo are united, their unassuming secretive patriarch does not rule, he reigns privately