An Irish surname meaning 'son of grace', commonly found in Ireland and among Irish diaspora communities.
From Irish Gaelic 'Mac Craith' meaning 'son of grace' or 'son of prosperity'. The 'Mc' prefix indicates 'son of' in Gaelic naming conventions, while 'Craith' derives from 'rath' meaning grace or prosperity.
McGrath is one of the most common surnames in County Clare, Ireland, and genetic studies have traced many McGrath families back to a common ancestor from the 12th century. The name appears in various spellings including MacGrath and Magrath.
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