75%RatingSave Gender Masculine Usage Irish (Rare) Pronounced Pron. /ˈɾˠiə.ɡaːnˠ/ [key·simplify] Meaning & History From Old Irish Riacán, probably derived from rí "king" combined with a diminutive suffix. Related NamesFamily Tree·Details RootríOther Languages & CulturesRiacán, Rígán(Old Irish) Surname DescendantsÓ Riagáin, Reagan, Regan(Irish) Categories king, leadership, rare Irish, royalty, uncertain etymology