Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
BELLAIRS
As described in historical dictionaries
Patronymica Britannica (1860)
BELLAIRS. Ilamon, one of the sons of Nigel de Albini liy I\Iaud do Aquila, niece of Hugh Lupus, assumed the name