Last name Moustarde (Mustard 
, Mostarda 
, Mosterd 
) , throughout the world, is quite a common family name. The cognomen Moustarde is habitual in Netherlands, where it is quite a rare surname, Italy, and Canada. Not in comparison with a country's population, it is commonest in the United States, Italy, and Netherlands. Much less frequently, Moustarde is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Mustard | United Kingdom, Netherlands, South Africa, Canada, United States |
| Mostarda | United Kingdom, Italy, Brazil, Canada, United States |
| Mosterd | Australia, Netherlands, South Africa, Canada, United States |
| Moustarde | France |