| Meaning | From Blaise — Latin Blasius, possibly from blaesus (lisping) or Greek blaisos (bow-legged) |
| Origin type | Saint's name → French surname |
| Popularity | Common in Quebec and Acadian French; moderate in New England |
| Regions | Quebec, Acadian Maritime provinces; New England mill towns |
| Variants | Blaise, Blasius, Blazy, Blazy |
| Notable bearers | Madeleine Blais (American journalist); Blaise Pascal (different French form) |
Blais derives from the personal name Blaise — the French form of the Latin Blasius. St Blaise (died c.316) was the bishop of Sebaste in Armenia who was martyred under the Roman Emperor Diocletian. The Feast of St Blaise on February 3rd became one of the popular devotional occasions of the medieval Catholic world — particularly associated with the blessing of throats, a tradition connected to the legend that St Blaise saved a child from choking on a fishbone. The name's popularity as a given name throughout France led directly to its adoption as a hereditary surname.
In France, Blais/Blaise is found throughout the country but shows particular strength in the western provinces — Normandy, Brittany, and the Loire valley — from which the Acadian settlers of New France largely derived. The name crossed the Atlantic with the seventeenth-century colonists of Acadia (what is now Nova Scotia, New Brunswick, and Prince Edward Island) and became embedded in the Acadian community.
After the 1755 Deportation and the return of Acadian families to the Maritime provinces in the following decades, Blais families spread through New Brunswick and Quebec. In the nineteenth century, the migration of French Canadians to the mill towns of New England carried the name to Massachusetts, Connecticut, Rhode Island, and Maine — the Franco-American communities of cities like Lowell, Manchester, and Woonsocket.
The Blais diaspora is concentrated in French Canada (Quebec and the Maritime provinces) and in the Franco-American communities of New England. The name is less common in Louisiana Cajun country than some other Acadian surnames, though it appears in Cajun records. In the United States, Blais families are most concentrated in the northeastern states, particularly in the former mill towns with large Franco-American populations.
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