Surname Нику (Nicu 
, Niku , Nyku 
) , in the world, is a common family name. The family name Нику is habitual in Romania, where it is quite a common surname, Moldova, and Albania. Not in comparison with a country's population, the name is most common in Romania, Moldova, and Ethiopia. More prevalently, Нику is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Niku, Nicu | Moldova, Romania, India, Italy, Albania |
| Nyku | India, Romania, Italy, Chile |
| Нику | Russia |