Entirely based on
https://sreenivasaraos.com/tag/govindacharya/
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It is said that it was Venkatamakhin’s grandson Muddu Venkatamakhin, who gave the nomenclature for the Mela Ragas, (Kanakambari, and Phenadhyuti etc) in his Gitam called Raganga Raga Anukramanika Gitam (numbered as 15.14.1 in Sri Subbarama Dikshitar’s Sangita Sampradaya Pradarshini (1904). Please check page 250 /664 of the web-page / page 207 of the Book .
In Muddu Venkatamakhin’s Ragalakshana a drastic shift takes place in the Mela-concept. He synthetically creates Janya Ragas for the remaining 53 Melas that were earlier considered non-functional.
Here for the first time the Raga-description is based purely on its Svara-sthanas. It is also at this stage that the Raga Grammar or its characteristic is described in terms of its Aroha and Avaroha Svaras.
(Please check here for Muddu Venkatamakhin’s Appendix (Anubandha) to Chaturdandi Prakashika )
Some say, it is likely that Muddu Venkatamakhin’s scheme grew in two stages. In the second stage the Katapayadi prefixes were added to suit the Raga-names; or the other way. The Gitas in the Raganga (Mela-kartha) Ragas bear the names with their Katapayadi prefixes.
Sri Muthusvami Dikshitar gave form to most of these Ragas through his compositions. As regards the A-sampura (not-sampurna) Ragas, Sri Muthusvami Dikshitar chose to change their structure in order to mitigate the ill-effects of direct Vivadi Svaras in their scale.
[Sri Subbarama Dikshitar while writing about the life of Sri Ramaswamy Dikshitar (father of Sri Mutthuswamy Dikshitar) says he learnt Mela system from Venkata Vaidyanatha Dikshitulu who was the maternal-grandson of Venkatamakhin (Vaggeyakara Caritramu, pg.25, SSP English Translation Vol.1). This Venkata Vaidyanatha Dikshitulu is identified by some as Muddu Venkatamakhi.