Last name Sepponen (Sepponen 
) , around the world, is a rare surname. The cognomen Sepponen is habitual in Finland, where it is quite a common surname, Estonia, where it is a rare surname, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
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| Sepponen | Estonia, United States, Finland |
| paavo sepponen Finnish amateur wrestler (1923-1998), FI (b. 1923) |
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| raimo sepponen Finnish ice hockey player, FI (b. 1936) |
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| kaarina sepponen (b. 1938) |
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| hannu sepponen Finnish musician, FI (b. 1959) |
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| sanna sepponen Finnish actress, FI (b. 1977) |
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| arto sepponen FI |
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| raimo sepponen |
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| pertti sepponen FI |
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Mr, Tupu, Niko, Eetu, Heli, Vesa, Olli, Marko, Matti, Maija, Milla, Minna, Miisa, Sanna, Salla, Saija, Saara, Sirpa, Seppo, Antti, Anssi, Arttu, Timo, Tomi, Juha, Jere, Ms, Anu, Nea, Mari, Mira, Miia, Sara, Sari, Sami, Simo, Bemmu, Suvi, Anni, Arto, Aino, Atte, Kari, Dani, Leea, Lina, Lisa, Jani, Anne, and Katja