| Meaning | Stonemason — from Old French masson (modern maçon) |
| Origin type | Occupational |
| Popularity | Common in northern France and French Canada |
| Regions | Normandy, Brittany, Île-de-France |
| Variants | Mason, Maçon, Massonnet, Lemason |
| Notable bearers | Frédéric Masson (historian of Napoleon) |
Masson is the French form of Mason — an occupational surname for a stonemason or builder in stone. The Old French masson (modern maçon) designated the skilled craftsmen who quarried, shaped, and laid stone in the construction of France's great medieval buildings: cathedrals, castles, city walls, and churches. Stonemasons occupied a high-status position in the medieval craft hierarchy, and their guilds were among the most powerful in France.
The name is concentrated in northern France — Normandy, Brittany, and the Île-de-France — where stone construction was most intensive during the medieval cathedral-building period. It appears in records from the thirteenth century and spread across France as stonework became central to both sacred and secular architecture.
The historical associations with Freemasonry, which traces its symbolic origins to the medieval stonemason guilds, give the Masson/Mason surname particular resonance in the history of secret societies and fraternal organisations.
Masson is well represented in French Canada, where families bearing the name arrived from Normandy and other northern French regions in the seventeenth century. The name appears consistently in Quebec colonial records.
In English-speaking contexts, the name sometimes anglicised completely to Mason — a transformation that lost the French origin but preserved the occupational meaning. Some French-Canadian Massons became Masons in English Quebec and in New England, where many French Canadians migrated in the nineteenth century.
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