Family History and Genealogy Resources by Surname
Sinclair Surname Origin
A corruption of St. Clair, and that from St. Clara, from the Latin clarus, pure, renowned, illustrious.
Source: An Etymological Dictionary of Family and Christian Names With an Essay on their Derivation and Import; Arthur, William, M.A.; New York, NY: Sheldon, Blake, Bleeker & CO., 1857.
Sinclair Surname Meaning and Family Facts
Sinclair Last Name Meaning
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There is more to Sinclair family history than the origin of your surname:
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A Sinclair Family History Thought:
'If man cares not for his roots, then how can he care for his branches?' --Doyle M Davis