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MANNIX Family HistoryThis rare and interesting surname is of Irish origin, and has two possible sources; the first source is a variant of (O) Manahan, which is from the Gaelic "O' Mainichin", derived from "manach", a monk. The second source is as a synonym of MacNeice, which is a variant of "MacAonghuis", son of Angus, a Gaelic personal name meaning "one choice". Mannix was a minor sept of Corca Laoidhe in the south-west of County Cork, the name was never numerous and is now scarce, being rarely found outside the counties of south-west Munster. The surname is sometimes Anglicized as Mannihan or Manahan...
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