Riordan

Riordan is a surname of Irish origin (Irish: Ó Ríordáin; Old Irish: Ó Ríoghbhardáin); Rearden and “Reardon” are variants of it. From ri “king” and bard “poet”, it means “royal poet”. In Irish tradition, the poet was very highly regarded in any royal household, as he acted as a scholar, historian and advisor to the king.