 Irish genealogies generally agree that Colmán had a father called Lénín.Through his father, Colmán appears to have been descended from the Rothrige, an obscure people who are known elsewhere as a subject people of the Déisi of Munster.Irish genealogies, however, go some way to associating Colmán's lineage with the Éoganachta, the leading ruling dynasty in Munster.