http://elderscrolls.wikia.com/wiki/Ainethach in Karthwasten is another named Forsworn, or at least a Forsworn descendant.
I don't think the Forsworn use names identical to High Rock Bretons...if you look at the http://www.uesp.net/wiki/Lore:Breton_Names of Breton names used throughout the series, they tend to have French roots (Etienne, Matthias, etc.) whereas the Forsworn lean a bit more toward straight up Gaelic. Braig and Donnel have strong Gaelic roots, for instance.
I'd start with the list Captain_Ginyu linked to and a list of Gaelic names (http://www.namenerds.com/scottish/gaelicguy.html) for picking out a name for your character.
