Patronymic was used by illegitimate royal children who were acknowledged as such by their fathers. The use of "Mac" in some form was prevalent in Scottish Gaelic, Irish and Manx, in all of which it denotes "son". "Mc" is also a frequent anglicisation in both Scotland and Ireland. In Ireland, the forms "Mag" and "M'" are encountered. The prefix "Mac" is used to form a patronym, such as "Mac Coinnich" – or the anglicized 'Mackenzie' – son of Coinneach/Kenneth. The female equivalent of "Mac" is "Nic", condensed from "nighean mhic" (in Scottish Gaelic) or "iníon mhic" (in Irish), both meaning daughter.
Keller (surname) Munster. The Anglicized surname in Ireland has many different spellings including: O'Kelleher, Kelaher, Kelliher, Kellar, Keller, McKeller, MacKeller, and O'Keller. People whose surname is or was Keller include: Keller (surname) Keller is a surname with several origins. The Irish version, which is the most ancient in origin, comes from the Gaelic surname Ó Ceilechair. In modern German Keller means cellar or basement, but historically it designates a cellarer or winemaker. A Latinized form of "Keller" is "Cellarius". Keller is an Anglicized version of the Old Irish surname Ó Céilechair (meaning descendant of Céilechair). Céilechair was descended from Cennétig mac Lorcáin