Cognomen Kainulainen (Kainulainen 
, Кайнулайнен 
) , around the world, is quite a rare family name. The surname Kainulainen is habitual in Northern Europe, particularly Finland, where it is quite a common surname, Estonia, where it is quite a rare surname, and Sweden, where it is a rare surname. Measured by absolute frequency, it most frequently occurs in Finland, Sweden, and the United States.
| VARIANT | COUNTRY |
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| Kainulainen | Finland, Norway, Spain, Sweden, United States |
| Кайнулайнен | Russia |
| juhana kainulainen FI (b. 1788) |
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markus kainulainen Finnish politician, FI (b. 1922) |
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| ruupert kainulainen FI (b. 1886) |
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| viljo kainulainen (b. 1894) |
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| heikki kainulainen Finnish politician, FI (b. 1917) |
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jari kainulainen Finnish musician, FI (b. 1970) |
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| martti kainulainen Finnish actor, writer, director and theatre manager (1927–2000), FI (b. 1927) |
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| paavo kainulainen FI (b. 1924) |
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| heikki kainulainen Finnish pesäpallo player and nordic combined skier, FI (b. 1936) |
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| juha kainulainen Finnish politician, FI (b. 1940) |
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| pekka kainulainen Finnish visual artist and lyricist, FI (b. 1956) |
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| kimmo kainulainen Finnish physicist, FI (b. 1962) |
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| kent kainulainen botanist, SE (b. 1970) |
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| tommi kainulainen Finnish association football player, FI (b. 1974) |
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| pauliina kainulainen FI (b. 1968) |
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Mr, Simo, Siru, Suvi, Alan, Anna, Anne, Anni, Anja, Arja, Asko, Aino, Atte, Beda, Kari, Kati, Kiti, Kiia, Paul, Pasi, Piia, Rony, Sini, Riku, Satu, Sami, Ms, Mia, Anu, Ari, Ada, Aki, Aku, Kim, Pã, Rea, Leo, Esa, Htm, Mari, Meri, Mira, Miro, Mika, Miia, Sara, Sari, Samu, and Ryan