Surname Niittykoski (Niittykoski 
) , around the globe, is a very rare cognomen. The last name Niittykoski is habitual in Northern Europe, particularly Finland, where it is a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Niittykoski | Finland |
| viljami niittykoski Finnish musician and composer (1895-1985), FI (b. 1895) |
|
|
|
otto niittykoski Finnish Nordic combined skier, FI |
|
| minna niittykoski researcher |
|