Surname Mostard (Mostard 
) , around the world, is a rare cognomen. The cognomen Mostard is characteristic of Netherlands, where it is a rare surname, Switzerland, and Australia, where it is a very rare surname. Much less frequently, Mostard is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Mostard | Netherlands, Tanzania, Switzerland, Australia, South Africa |
| leenderd mostard Dutch Righteous Among the Nations, NL (b. 1893) |
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| cornelia mostard Dutch Righteous Among the Nations, NL (b. 1894) |
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| frank mostard NL (b. 1992) |
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