12: William MacDhòmhnaill -New Name (NP)
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William: masculine proper name, from old north (Norman) French "Williame" or "Guillame" of Germanic origin (cognates Old High German "Willahelm", Willhelm") From "Willio" and "Helma" = the Proto-Germanio "Helmaz".
Mac Dhòmhnaill: the MacDhomhanill descend from Dhomhnaill (Donald) son of Reginald (or Ronald) Mac Somerled who was king of the Isles, Lord of Argyle and Kintyre (1164-1207) pp: 91-93 Clans and Families of Ireland and Scotland (an Ethnography of Gael AD 500-1750) by C Thomas Carney PHd, Heritage Books INC, copyright 1989 ISBN: 978-1-58549-070-9
See also MacDhomhnaill Dhiubh: patronymic of Cameron of Lochiel pgs 485-486 Black, George Fraser, 1866-1948, and New York Public Library. The Surnames of Scotland: Their Origin, Meaning, And History. New York: New York Public Library, 1946.