Cognomen Pyysiäinen (Pyysiäinen 
) , all around the world, is an extremely rare surname. The last name Pyysiäinen is habitual in Northern Europe, particularly Finland, where it is a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Pyysiäinen | Finland |
| valdemar pyysiäinen Finnish painter, FI (b. 1902) |
|
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| ilkka pyysiäinen Finnish cognitive science of religion scholar, FI (b. 1959) |
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