De Bluinnsíol
de BLUINNSÍOL—XI—de Blauncheuill, de Blancheville, Blanchville, Blanchfield; i.e. 'of Blanchville,' probably somewhere in Normandy. This family, which is of Norman origin, came into Ireland soon after the invasion and settled in Co. Kilkenny, where they held a prominent position down to the Cromwellian confiscations. Sir Edmund Blanchville forfeited his estates by attainder in 1641. The name, in the spoken language, is corrupted to Bluinnsín, and is even so written by Keating.
Alphabetical Index to Irish Surnames