Family name Tuunainen (Tuunainen 
) , in the world, is a rare cognomen. The cognomen Tuunainen is habitual in Northern Europe, particularly Aland Islands, where it is quite a common surname, Finland, where it is quite a rare surname, and Latvia, where it is a rare surname. Not in comparison with a country's population, it is commonest in Finland, Germany, and Aland Islands.
| VARIANT | COUNTRY |
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| Tuunainen | Germany, Aland Islands, South Africa, Finland, Latvia |
| jarno tuunainen Finnish footballer, FI (b. 1977) |
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| arja tuunainen researcher |
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| anna-kaisa tuunainen researcher |
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| tommi tuunainen FI |
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| milja tuunainen FI |
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Mr, Usko, Marco, Marko, Marja, Matti, Mirja, Minna, Sanna, Sirpa, Sonja, Katri, Kaisu, Petra, Petri, Pekka, Ranys, Raimo, Reino, Leevi, Liisa, Janni, Urpo, Vesa, Eeva, Emma, Ms, Aku, Mari, Mika, Miia, Sari, Arto, Arja, Kari, Kati, Jarmo, Panu, Jani, Joni, Joel, Juha, Jyri, Tomi, Toni, Timo, Tiia, Enna, Pasi, and Jarno