Surname Vaillancour (Vaillancour 
) , globally, is a very rare family name. The surname Vaillancour is habitual in Canada, where it is a very rare surname, the United States, where it is an extremely rare surname, and the United Kingdom. Much less frequently, Vaillancour is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Vaillancour | Canada, United Kingdom, United States |