Family name Круус (Круус 
, Kruus 
) , in the world, is quite a rare cognomen. The family name Круус is characteristic of Northern Europe, particularly Estonia, where it is quite a common surname, Finland, where it is quite a rare surname, and Sweden.
| VARIANT | COUNTRY |
|---|---|
| Круус | Russia, Estonia, Ukraine |
| Kruus | Finland, Estonia, Sweden, United States, Norway |
| круус, яан Estonian military personnel, RU (b. 1884) |
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| круус, хейно рихардович Estonian basketball player, EE (b. 1926) |
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