Definition of "Regan"

A surname from Irish from Irish Ó Riagáin, variant of Reagan.  examples

A male given name transferred from the surname.  examples

A female given name transferred from the surname or from the name of the evil daughter of King Lear. William Shakespeare may have got the name from the ultimately same Irish source.  examples

A minor city in Burleigh County, North Dakota, United States.  examples