From Irish Names and Surnames 1923
Mac OITIR—V—M'Cottyr, M'Cottir, MacCotter, MacCottier, MacCottar, Cotter, Otterson; 'son of Ottar' (a Norse personal name); the name of an old and respectable family, doubtless of Norse origin, seated at Carrigtwohil, near the city of Cork; also an Ulster surname; generally written Mac Coitir, owing to the attraction of the c of Mac over to the second part of the surname.
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