Cognomen Tammjärv (Tammjärv 
) , all around the world, is a very rare surname. The surname Tammjärv is habitual in Northern Europe, particularly Estonia, where it is a rare surname, and Sweden.
| VARIANT | COUNTRY |
|---|---|
| Tammjärv | Sweden, Estonia |
|
karel tammjärv Estonian cross-country skier, EE (b. 1989) |
|
| kärt tammjärv Estonian actress, EE (b. 1991) |
|