(m) A Norman placename which was transferred
to Scotland as a surname as early as the twelfth century. An offshoot
of the family held the earldom in Caithness until 1542. Sinclair
is now occasionally used as a Christian name. It is a form of
Saint Clare, a placename in Pont d’Eveque, Normandy. The
Gaelic surname Mac Na Geaird is also rendered as Sinclair, though
Tinkler (‘Tinker’) would be more correct.
To Scottish Christian Names