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What Does Costello Means?

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Sana Rashid Profile
Sana Rashid answered
It sure is a rare name. I will copy the meaning I have found here and not try to simplify it in my own words, so that I may not change it somehow:
 
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'.

 

For more information on Costello family history, go to this link:

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