Cognomen Ysern (Ysern 
) , around the world, is a rare last name. The surname Ysern is habitual in Spain, where it is a very rare surname, France, and Peru. In absolute terms, it is commonest in France, Spain, and the United States. Likewise, Ysern is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ysern | Spain, France, United States, Peru, Venezuela |
| gilbert ysern FR (b. 1956) |
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| bernardo de la calle ysern Ph.D. Universidad Carlos III de Madrid 2000 |
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