In addition, short forms of patronymics can often be observed, which usually arise as a result of reduction and subsequent omission of pre- or posttonic syllables. For example, the patronymic Matthäus could become Theves after the omission of the first syllable (and fricativization of the glide).
Schanen (1880:71, 2009:139), Jean (1880:3, 2009:16)
Already the 15th-century account books of the city of Luxembourg analyzed by Gniffke 2011 attest to numerous forms with the voiceless fricative in the initial position, starting with the French name Jean: Schain, Schan; and starting with the feminine name Jeanne: Schanne, Schannen, Schentgen. The surname Schanen is a form obtained by inflection of Schan. Jean (in red) is a widespread surname both in France and Wallonia, while Schanen (in blue) is distributed almost exclusively within Luxembourg; only a few bearers are attested in the Eifel and Saarlands on the German side. In Germany, the presence of the name Schan is also attested, which could, especially for occurrences in the Palatinate, represent
the Germanized form of John, without inflection marks. The meaning of the name Schan,
especially that of the attestations scattered throughout the rest of the country, is, however, ambiguous.
Gniffke, Andreas: Die Personennamen der Stadt Luxemburg von 1388–1500. Namenbuch and namenkundliche Analyze auf Basis der Rechnungsbücher der Stadt Luxemburg. Unveröffentlichte Dissertationsschrift, eingereicht an der Universität Luxemburg 2010
Moulin, Claudine / Pauly, Michel (Hrsg.): Die Rechnungsbücher der Stadt Luxemburg. Erstes Heft 1388–1399 2007, Zweites Heft 1400–1430 2008, Drittes Heft 1444–1453 2009, Viertes Heft 1453– 1460 2010, Fünftes Heft 1460–1466 2010. Luxemburg 2007–2010 (= Schriftenreihe des Stadtarchivs Luxemburg Bd. 1–5).