Cognomen Naissoo (Naissoo 
) , all around the world, is a very rare last name. The cognomen Naissoo is habitual in Northern Europe, particularly Estonia, where it is quite a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Naissoo | Estonia |
|
tõnu naissoo Estonian composer, EE (b. 1951) |
|
| jaan naissoo (b. 1903) |
|