Last name Riihikoski (Riihikoski 
) , in the entire world, is a very rare cognomen. The last name Riihikoski is habitual in Finland, where it is a rare surname, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Riihikoski | United States, Finland |
| olli-pekka riihikoski Finnish visual artist (b. 1947) |
|
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| ville-matti riihikoski |
|