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Traditionally Irish clans were territorial clans unlike Scottish clans which were strictly family clans. All families living within the desmense of the ruling lord was a member of his clan. Irish names often had the prefixes "O" (grandson or descendant of) "Mac" "Mc" "Ma" (son of). However, after immigrating to America, Canada, Australia, and elsewhere, the expatriate Irish often dropped these prefixes to get around the prejudice they found in their new homelands.
Clan Cian is the personal clan of The O'Carroll of Éile O'Carroll. He has opened the clan for membership to all the descendants of the sons of the ancient King of Munster, Olioll Olum and all those who support the goals of his clan.
His sons were named Cian, Eoghan, and Cas; and from them descend the Elyan, Eugenian, and Dalcassian families. Members of Clan Cian are those families who lived within the following districts in Ireland and those families originally living in Éile O'Carroll who immigrated or were dispossed of their lands and settled in other parts of Ireland: