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From ri "sovereign, king" and the diminutive -in and means "the king's child" Riagán, Ríogáin, Ó Riagáin, Ó Ríogáin, O Regan, O'Reagan, O'Regan, Riggin, Riggins |
The family name Regan, and its cognates O'Regan, O Regan, Reagan, O'Reagan, is an Anglicized form of the Irish surname Ó Riagáin or Ó Ríogáin, from Ua Riagáin. The meaning is likely to originate in ancient gaelic from ri "sovereign, king" and the diminutive -in, "the king's child", transliterating as "little king".
The feminine unisex forename, Regan, is likely to have derived sometime later from the English royal name Regina.
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