Harvey

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From Haerviu, name of a Breton saint, from Old Breton hoiarn(“iron”) + viu(“blazing”). Cognate to modern Breton Haerviu.

In Ireland, used as an anglicisation of Irish Ó hAirmheadhaigh and Ó hEarchaidh.


etymonline

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Harvey

masc. proper name introduced in England by Bretons at the Conquest; from Old French Hervé, Old Breton Aeruiu, Hærviu, literally "battle-worthy."