Last name Pihlakoski (Pihlakoski 
) , in all the world, is a very rare surname. The cognomen Pihlakoski is characteristic of Northern Europe, particularly Finland, where it is a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Pihlakoski | Finland |
|
antti pihlakoski Finnish middle-distance runner, FI (b. 1961) |
|
| pentti pihlakoski FI (b. 1928) |
|