Cognomen Happonen (Happonen 
) , in all the world, is quite a rare last name. The cognomen Happonen is characteristic of Finland, where it is quite a common surname, Bermuda, where it is quite a rare surname, and Estonia, where it is a rare surname. In absolute terms, the name is most common in Finland, Sweden, and Germany. Much less frequently, Happonen is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Happonen | Germany, Estonia, Finland, Sweden, United States |
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onni happonen Finnish politician, FI (b. 1898) |
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päivi happonen Finnish historian, FI (b. 1967) |
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| leo happonen Finnish politician, FI (b. 1922) |
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olli happonen Finnish ski jumper, FI (b. 1976) |
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| pentti happonen Finnish painter, FI (b. 1929) |
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janne happonen Finnish ski jumper, FI (b. 1984) |
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| seija happonen Finnish pesäpallo player (1935-2016), FI (b. 1935) |
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| yrjö happonen Finnish association football player, FI (b. 1970) |
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| sirke happonen Finnish translator, FI (b. 1971) |
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| juha happonen FI (b. 1963) |
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| matti happonen researcher |
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| tuomas happonen researcher (ORCID 0000-0002-7546-3937) |
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| konsta happonen researcher ORCID ID = 0000-0002-3164-8868 |
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| kaisa e happonen researcher |
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| päivi happonen Finnish journalist who works at the Finnish Broadcasting Company, FI |
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Mr, Arho, Asko, Atro, Aaro, Aatu, Aapo, Kari, Kati, Kiia, Panu, Paul, Pasi, Piia, Pyry, Rosa, Riku, Jani, Jari, Joni, Juha, Juho, Arja, Arto, Anni, Anne, Ms, Mel, Ari, Amy, Ada, Aki, Ken, Pia, Pã, Leo, Taru, Fia, Mika, Sara, Sari, Sami, Satu, Saku, Simo, Suvi, Alex, Anna, Mari, and Tomi