Fionnúir, Fionúir
FIONNÚIR, FIONÚIR—XI—Fynnor, Fennors; probably Norman 'de Finnure,' i.e., of Fionnabhair, a frequent Irish place-name; one of the small group of Norman surnames formed from Irish place-names. There can hardly be any doubt about this derivation, but I have not discovered any early forms that would prove it. The surname is an old one in Tipperary and Kilkenny.
Alphabetical Index to Irish Surnames