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Surname Etymology and Meaning of SHANAHAN

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Name meanings and etymologies are often disputed. The information here is compiled from freely available sources, and no claims whatsoever are made for accuracy, either historical or etymological.

Irish (Munster): reduced Anglicized form of Gaelic Ó Seanacháin ‘descendant of Seanachán’, a diminutive of Seanach, a personal name from sean ‘ancient’, ‘old’.

Source: Dictionary of American Family Names (2003)