Family name Niilo (Nils 
, Niilo 
, 尼洛 
) , throughout the world, is quite a rare surname. The family name Niilo is characteristic of Estonia, where it is quite a rare surname, Sweden, and Belgium. Measured by absolute frequency, it is commonest in Sweden, Germany, and Spain. Predominantly, Niilo is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Nils | Germany, Democratic Republic of the Congo, Sweden, United States, Norway |
| Niilo | Finland, Germany, France, Sweden, United States |
| 尼洛 | China |
| tiit niilo Estonian politician, EE (b. 1962) |
|