A rare French surname-style form, likely geographic or occupational in origin.
Dumier is a rare French surname-style form, likely tied to a geographic place or an occupational background rather than to the more familiar given-name traditions. That gives it an old-world, slightly aristocratic texture, the sort of texture that many French surnames carry even when they move into first-name use.
It sounds established, though not common as a personal name. As a given name, Dumier has a dignified and somewhat literary feel. The final -ier ending makes it sound unmistakably French, while the overall shape remains compact and serious.
It does not try to be cute or decorative; instead, it feels restrained and formal. That restraint can make it memorable, because the name suggests lineage and place more than fashion.