stclair

St. Clair is a toponym and surname of French origin, derived from references to Saint Clare/Clair. In English-language usage, the name appears in place names across Canada and the United States, as well as in personal names.

Geography and political subdivisions commonly bearing the name include the St. Clair River, which connects Lake Huron to Lake St. Clair and forms part of the border between Ontario and Michigan. The name is also attached to multiple counties in the United States, most notably St. Clair County, which exists in Alabama, Illinois, Michigan, and Missouri. In addition, there are towns, townships, and small communities named St. Clair in various states and provinces.

In addition to its geographic usage, St. Clair is used as a surname and as a given name. It appears among historical and contemporary figures in politics, sports, the arts, and other fields, and is encountered in fiction and public records in English-speaking countries.

Variant spellings and related names include Saint Clair and Saint-Clair. The root is connected to Saint Clare/Clare in various languages, and related to toponyms formed from the names of saints in French- and English-language traditions. For researchers and readers, distinctions among Saint Clair, St. Clair, and similar forms often reflect regional spelling conventions and historical usage.