Family name Lempiäinen (Lempiäinen 
) , around the world, is a rare last name. The family name Lempiäinen is characteristic of Finland, where it is quite a rare surname, Sweden, where it is a rare surname, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
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| Lempiäinen | Sweden, Finland, United States |
| pekka lempiäinen FI (b. 1888) |
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| pentti lempiäinen Finnish priest, FI (b. 1932) |
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| terttu lempiäinen Finnish botanist (1945 - ), FI (b. 1945) |
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| ulla lempiäinen Finnish sprinter, FI (b. 1950) |
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| harri lempiäinen researcher |
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| tuomo lempiäinen researcher ORCID ID = 0000-0003-2436-5381 |
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| päivi a lempiäinen researcher (ORCID 0000-0003-1028-007X) |
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| anna lempiäinen researcher |
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| lauri lempiäinen correspondence chess player |
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| sari lempiäinen FI (b. 1976) |
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| minna lempiäinen FI |
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| elisa lempiäinen FI |
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Mia, Juha, Juho, Taru, Tatu, Tero, Timo, Tiia, Nina, Elli, Essi, Eero, Eetu, Ossi, Marja, Matti, Minna, Mikko, Mikke, Sanna, Sanni, Saija, Jere, Joni, Jari, Jani, Anu, Ari, Esa, Ida, Mari, Mona, Mika, Sara, Sari, Sami, Seija, Samu, Anna, Anne, Anja, Arto, Aino, Kari, Kati, Kris, Panu, Rami, Satu, and Sofia