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Last name Ruadhán (Ruadhán ) , throughout the world, is an extremely rare cognomen. Much more prevalently, Ruadhán is the forename as well as the last name.
Rowan, Ruadh, and Ruadhan
Rú, Duffy, Harle, Glover, Ciaráin, Harrison, Mcgrillen, and Keogh Daly