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The surname of Sinclair in French is “de Sancto Claro” and in Latin, “Sanctus Clarus,” meaning Holy Light. The name derives from the hermit St. Clare and St. Clair-sur-Epte, a town near Paris close to the location of the hermit St. Clare’s martyrdom.
No certain record exists but it is likely that the Sinclairs came from Saint-Clair in Normandy.[11] The Saint-Clairs first went to England (before they came to Scotland) with William the Conqueror during his invasion of England.[12] The name was originally "Saint-Clair" which was a place name.[12] Richard of Saint-Clair and Brittel of Saint-Clair are both mentioned in the Domesday Book.[12] William of Saint-Clair accompanied Saint Margaret of Scotland, daughter of Edward the Exile to Scotland in 1068, where she eventually married Malcolm III of Scotland. In return for his efforts, the king supposedly granted Sinclair the barony of Roslin, Scotland "in free heritage".[12]
One of the earliest recorded Sinclairs in Scotland was Henry of Saint-Clair/Sinclair, who obtained a charter for the lands of Herdmanston in Haddingtonshire in 1160.[12]