Save Type Surname (from given name) Usage Irish Expand LinksMeaning & History Anglicized form of Ó RIAIN, or else a simplified form of MULRYAN. DetailsRelated Names VariantsMulryan, Ó Maoil Riain, Ó RiainGiven Name DescendantRyan(Irish) Categories anglicizations Entry updated October 30, 2011 ·