Wilielmus

• (Classical) IPA^(key): /u̯i.liˈel.mus/, [u̯ɪlʲiˈɛɫ̪mʊs̠]
• (modern Italianate Ecclesiastical) IPA^(key): /vi.liˈel.mus/, [viliˈɛlmus]

Wilielmus m (genitive Wilielmī); second declension

1. Alternative form of Gulielmus (“a male given name, equivalent to English William”)
   • c. 13th century, [charter “in the Cartulary of the Priory of St. Andrew’s”]; quoted in “Abbacy of Haddington, Parish Church of Haddington, and other Religious Foundations, with the succession of Ministers since the Reformation, and other particulars relating to Ecclesiastical History”, in Archaeologia Scotica: or Transactions of the Society of Antiquaries of Scotland, volume I, Edinburgh: […] the Society, 1792, page 65:

     Carta Wilielmi‡ Epiſcopi, Vicariae de Hadingthoun.

     (please add an English translation of this quotation)

     ‡ William Malvoiſin, preferred to be Lord High Chancellor 1199, tranſlated to St. Andrew’s 1202, died 1233.

Second-declension noun.