Original name of the rock-band-with-Celtic-influences Seven Nations in 1993 and 1994.
Also the name of an Everquest clan (ah, those Google searches), the slightly-differently-spelled name of an organization that seeks to create an Irish/American Cultural Center in Atlanta (see Clan na nGael), the name of a now-defunct Celtic folk group based in Nevada from 1992 to 1999, and the name of at least a couple of Gaelic football teams.
No wonder the Seven Nations guys changed their name.