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In page Surname:

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The common Celtic prefixes "Ó" or "Ua" (descendant of) and "Mac" or "Mag" (son of) can be spelled with the prefix as a separate word, yielding "Ó Briain" or "Mac Millan" as well as the anglicized "O'Brien" and "MacMillan" or "Macmillan". Other Irish prefixes include , Nic (daughter of the son of), Mhic, and (wife of the son of).[citation needed]