Sinclair
A Scottish surname meaning “Saint Clair,” originally taken from a Norman place-name and later commonly fused into one word.
The #1,290 most common surname in the United States (2010 Census) — about 1 in every 11,333 Americans shares it.
Etymology
Sinclair is generally explained as a reduced form of Saint Clair, a French place- and family name. The underlying Latin element is clarus, meaning “clear,” “bright,” or “illustrious,” which appears in medieval forms such as de Sancto Claro. In Scotland and English usage, the saintly/locational form was gradually worn down into Sinclair, with Saint Clere and similar spellings also recorded.
History
The name is strongly associated with the Scottish noble house descended from the Norman family of de Sancto Claro, especially through the lords of Rosslyn. Historical dictionaries note that the spelling Sinclair became the familiar Scottish form, while Saint Clair and Saint Clere survived as related variants. The surname is now common in Scotland and widely established in the English-speaking world.
Origin
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Fun fact
Medieval records sometimes Latinized the name as de Sancto Claro, preserving its original “Saint Clair” sense in formal documents.
From the historical record
“SIMSON, Sim's Son; SINCLAIR (A.-Fr.-Lat.) Bel. to St. Clair (several in Normandy) [Fr. clair, Lat. clar-us, clear, bright, illustrious] This name was Latinized in mediaeval deeds de Sancto Claro. SINCOCK for Simcock, q.v. SINCOX for Simcox, q.v.”
— Surnames of the United Kingdom: a concise etymological dictionary (2 vols in 1)