Balliol is the surname of a
Norman French family that settled in northern England and southern Scotland after the
Norman conquest. The surname indicates that they came from Bailleul, a place in the province of Picardy in
France. One of the oldest parts of Oxford University in England is Balliol College, named after this family.
http://www.crwflags.com/fotw/Flags/fr-59-ba.html
http://www.britannica.com/EBchecked/topic/50655/Balliol-family
Perhaps the name was adopted because it resembles a name in the Rom language, but the "upper class" associations of the name probably also operated in making it seem like an interesting "English" name to adopt in Rom culture.