Family name Jämsén (Jämsén 
) , throughout the world, is a very rare last name. The cognomen Jämsén is characteristic of Northern Europe, particularly Finland, where it is quite a rare surname, and Sweden, where it is a rare surname.
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| Jämsén | Sweden, Finland |
| artturi jämsén Finnish politician, FI (b. 1925) |
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matti jämsén Finnish chef, Chef of the Year 2005 (Finland), FI (b. 1979) |
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| esko jämsén Finnish journalist, FI (b. 1938) |
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| kauko jämsén Finnish journalist, FI (b. 1943) |
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ella jämsén sportsperson, SE |
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| sami jämsén Finnish photographer, director and music video director, FI |
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| vilho jämsén |
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| antti jämsén FI |
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| tomi jämsén FI |
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| olli jämsén FI |
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| reijo jämsén FI |
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| martta jämsén FI |
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Mia, Lotta, Janne, Jarmo, Jonna, Jussi, Jukka, Tanja, Taina, Teemu, Tuija, Tuula, Niina, Eelis, Veera, Magnus, Perttu, Janita, Jaakko, Joonas, Juhana, Taneli, Lauri, Raija, Paula, Arttu, Ari, Aku, Sari, Sami, Satu, Anna, Arja, Kari, Jani, Jari, Tuomas, Joni, Tatu, Emma, Immu, Marko, Matti, Merja, Sanna, Saila, Antti, Anssi, Juha, and Niklas