The name Costello in Ireland is of Anglo-Norman origin deriving from the de Nangle family who were based in the Province of Connaught. The family adopted the Gaelic name Mac Oisdealbhaigh and the Sept name eventually became anglicized as Costello. The majority of descendants can still be found in the West of the country. Most of our descendants came from Scotland.
...but our Costello family lives in snowy Rochester, New York
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