Family name Ruadhan (Ruadhan 
) , in all the world, is an extremely rare cognomen. Much more frequently, Ruadhan is the forename as well as the last name.
Gee, Mannion, Mckeone, Mcelroy, Killeen, Victory, Farrell, Furlong, Wilson, O'Toole, Mccarthy, Mclennan, Corrigan, Branigan, Donnelly, O'Sheridan, Kirschner, O Connor, Nethercott, Neeson, Currie, King, Nidh, Ward, Maher, Cowan, Barry, Kelly, Taylor, Pitts, Duffy, Jones, Elder, Hayes, Magill, Murray, Slevin, Dunne, and Gillespie-Mules