The costello Surname
costello Name Meaning and History
Irish: reduced Anglicized form of Gaelic Mac Oisdealbhaigh
‘son of Oisdealbhach’, a personal name composed of the elements
os ‘deer’, ‘fawn’ + dealbhach ‘in the form of’,
‘resembling’.
Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4
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