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I'm a Monahan from Monaghan. I always regarded the names from being of different origin. Monahan is a Roscommon name derived from Monk. The original clan said to be descended from a 16th century warrior monk in the area. The gaelic being O' Manachain. The place name Monaghan or Muineachain is said to indicate a place of thicket or briar.

To add confusion I don't have the G in my name yet my uncle does. It all depended on what was registered at birth.