O'Callahan
Name Origin
Name Origin

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What does the O'Callahan surname reveal about your family history?

The earliest occurrence of the O'Callahan surname in our family history documents is from 1750, and we currently have 2,656 records where O'Callahan appears. Here are a few more facts to get you started…

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O'Callahansin military records

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O'Callahansin census records

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O'Callahansin convict records

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O'Callahansin parish records

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