what nationality is the last name reagan
For other uses, see Regan (disambiguation). Regan, and its cognates O'Regan, O Regan, Reagan, O'Reagan, is an Anglicized form of the Irish surname Ã³ RiagÃ¡in or Ã³ RÃ­ogÃ¡in, (from RiagÃ¡n) derived from the Irish personal name RiagÃ¡n, which is of uncertain origin but may come from riagach, meaning angry or impulsive. It is also a unisex given name.