Cognomen Piiroinen (Piiroinen 
) , all over the world, is quite a rare surname. The surname Piiroinen is habitual in Northern Europe, particularly Finland, where it is quite a common surname, Estonia, where it is a rare surname, and Sweden. Measured by absolute frequency, it is the most numerous in Finland, Sweden, and Australia.
| VARIANT | COUNTRY |
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| Piiroinen | Australia, Sweden, Finland, Estonia, Denmark |
| erkki piiroinen (b. 1919) |
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| janne piiroinen Finnish musician, FI (b. 1968) |
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| heidi piiroinen Finnish photographer and film director, FI (b. 1978) |
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| samuli piiroinen Finnish ice hockey player, FI (b. 1979) |
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| petteri piiroinen Ph.D. Helsingin yliopisto 2005 |
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| saija piiroinen researcher, FI |
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| johanna piiroinen Finnish actress (b. 1985) |
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| peetu piiroinen Finnish snowboarder, FI (b. 1988) |
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| heikki piiroinen FI |
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| mika piiroinen FI |
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| petja piiroinen Finnish snowboarder, FI (b. 1991) |
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| kari piiroinen Finnish ice hockey goaltender, FI |
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Mr, Arto, Arja, Auli, Atte, Aatu, Kari, Kati, Kimi, Paul, Pasi, Piia, Jani, Jari, Joni, Joel, Juha, Juho, Taru, Toni, Tero, Timo, Annu, Anni, Anna, Suvi, Ms, Mia, Anu, Ari, Aki, Kai, Pia, Pã, Lea, Esa, Tiia, Mira, Mika, Miia, Sara, Sari, Sami, Samu, Satu, Sini, Simo, Susa, Miri, and Nico