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Cognomen Jaern (Jaern
) , in the world, is a very rare family name. The surname Jaern is characteristic of Sweden, where it is a rare surname, Portugal, and New Zealand, where it is a very rare surname. In absolute terms, the name is most common in Sweden, Portugal, and Brazil.
| VARIANT | COUNTRY |
|---|---|
| Jaern | Portugal, Canada, Brazil, India, Sweden |