Last name Petäjä (Petäjä 
, Петяя 
) , all over the world, is a rare family name. The cognomen Petäjä is characteristic of Finland, where it is quite a rare surname, Sweden, where it is a rare surname, and Russia, where it is an extremely rare surname.
| juhani petäjä FI (b. 1888) |
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| sisko petäjä Finnish sculptress, FI (b. 1917) |
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| keijo petäjä Finnish architect, FI (b. 1919) |
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| matti petäjä FI (b. 1912) |
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| paavo m. petäjä Finnish jurist, civil servant and sports administrator, FI (b. 1936) |
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| jukka petäjä Finnish culture journalist, FI (b. 1956) |
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| erkka petäjä association football player from Finland, FI (b. 1964) |
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| tom petäjä Finnish actor, FI (b. 1970) |
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| tuukka petäjä Finnish aerosol physicist, professor of experimental atmospheric sciencies / physics (University of Helsinki), FI (b. 1975) |
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| pentti petäjä Finnish architect, FI |
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| marja petäjä Finnish architect, FI |
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| ilkka petäjä |
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Anu, Mikko, Salla, Antti, Anssi, Katja, Kirsi, Paavo, Petri, Pekka, Lauri, Leena, Liisa, Janne, Jesse, Jenni, Jussi, Jutta, Jukka, Tommi, Erkki, Erkka, Olli, Ilpo, Vesa, Eija, Pia, Evi, Ida, Miro, Mika, Sari, Sami, Satu, Suvi, Anni, Ethel, Kari, Piia, Lila, Jani, Jari, Jere, Juha, Tina, Timo, Ella, Esko, Pasi, and Hanna