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Re: what does my last name mean?
English: habitational name from Cosgrove in Northamptonshire, named with an Old English personal name Cōf + Old English grāf ‘grove’, ‘thicket’.
Irish: surname adopted from English by bearers of the Gaelic name Ó Coscraigh ‘descendant of Coscrach’, a byname meaning ‘victorious’, ‘triumphant’ (from coscur ‘victory’, ‘triumph’).

(Dictionary of American Family Names, Oxford University Press)www.ancestry.com
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