Family name Lajunen (Lajunen 
) , all over the world, is a rare surname. The surname Lajunen is habitual in Finland, where it is quite a common surname, Canada, where it is a very rare surname, and Turkey, where it is an extremely rare surname.
| VARIANT | COUNTRY |
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| Lajunen | Turkey, Finland, Canada, United Kingdom |
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ville lajunen Finnish ice hockey player, FI (b. 1988) |
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jani lajunen Finnish ice hockey player, FI (b. 1990) |
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| lauri lajunen Finnish chemist and university professor, FI (b. 1950) |
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| heikki lajunen Finnish singer (1952-2017), FI (b. 1952) |
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| samppa lajunen Finnish former Nordic combined skier, FI (b. 1979) |
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| timo lajunen researcher |
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| taina lajunen researcher |
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| katariina lajunen researcher |
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| tatu lajunen researcher (b. 1981) |
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| akseli lajunen Finnish ski jumper and Nordic combined athlete, FI (b. 1982) |
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| jaakko lajunen FI |
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| liisa lajunen FI |
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| timo lajunen FI |
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| laura lajunen Finnish swimmer, FI (b. 1992) |
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Mr, Emmi, Eila, Eeva, Inka, Olli, Marja, Matti, Minni, Mikko, Antti, Anita, Bodie, Katja, Kaija, Kirsi, Kimmo, Petri, Pekka, Raimo, Laura, Lauri, Erja, Leena, Erik, Nico, Ms, Max, Ari, Dan, Mika, Anna, Anni, Aino, Atte, Kari, Kati, Jani, Jari, Joni, Jyri, Tatu, Tomi, Topi, Tero, Timo, Tiia, Nina, and Janne