O'Regan Family CrestThe Irish surname O’Regan  is an anglicized form of the Gaelic name Ó Riagain which means “descendant of Riagán.” The personal name Riagán is of uncertain origin, perhaps akin to ríodhgach which means “impulsive or furious.” There are two families of the surname O’Regan, one in Meath and and one in Munster. Both families claim descent from Riagán a nephew of Brian Boru who was the last High King of Ireland.

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