Sinclair : 1: Scottish and English: of Norman origin a habitational name from Saint-Clair-sur-Elle (Manche) so called from the dedication of its church to Saint Clarus (see Clare 3).2: Americanized form of some similar (like-sounding) Jewish surname.
Source :
DAFN2 : Dictionary of American Family Names 2nd edition, ©2022 by Patrick Hanks and Oxford University Press
