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Cognomen Viljak (Viljak
, Виляк
) , throughout the world, is a rare family name. The surname Viljak is habitual in Northern Europe, particularly Estonia, where it is quite a rare surname, Latvia, where it is a rare surname, and Finland. In absolute terms, it is the most numerous in Estonia, Russia, and Finland.
| VARIANT | COUNTRY |
|---|---|
| Viljak | Latvia, Estonia, Finland, United States |
| Виляк | Russia |