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Surname Etymology and Meaning of GROGAN

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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.

1. reduced Anglicized form of Gaelic Ó Grúgáin ‘descendant of Grúgán’, a personal name from a diminutive of grúg ‘anger’, ‘fierceness’.
2. reduced Anglicized form of Gaelic Ó Gruagáin ‘descendant of Gruagán’, a personal name from a diminutive of gruag ‘hair’. The patronymic form Mac Gruagáin (Anglicized McGrogan) is much rarer.

Source: Dictionary of American Family Names (2003)