Last name FITZROY: origin and meaning

Fitzroy : Irish: Anglo-Norman French patronymic from fi(t)z ‘son’ (see Fitz) + Roy ‘king son of the king’. It is usually taken to imply that the original bearer was a bastard son of the king though ‘son of Ruadh’ (a Gaelic nickname meaning ‘red’) is also a possible interpretation.

Source : DAFN2 : Dictionary of American Family Names 2nd edition, ©2022 by Patrick Hanks and Oxford University Press

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