Calnan (surname)

Calnan is a surname found in England and in Ireland with several origins.
Originating from the Irish Gaelic O Cathalain.
Royal connections.
The name is derived from Cathalan, King of Farney slain in 1028, whose name means Little Charles, and from whom the family is thought to have descended. Cathalan was in turn descended from Coleman Mor, the King of Meath and the 133rd Monarch of Ireland.