Surname Tiainen (Tiainen 
) , around the world, is quite a rare last name. The last name Tiainen is habitual in Northern Europe, particularly Finland, where it is quite a common surname, Estonia, where it is quite a rare surname, and Sweden, where it is a rare surname. Not in comparison with a country's population, it is the most numerous in Finland, Sweden, and Australia.
| VARIANT | COUNTRY |
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| Tiainen | Australia, Estonia, United States, Sweden, Finland |
| olli tiainen Finnish military personnel, FI (b. 1770) |
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lauri tiainen Finnish military commander, FI (b. 1890) |
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| leo tiainen Finnish poet, FI (b. 1909) |
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| ilmari tiainen Finnish politician (1912-1953), FI (b. 1912) |
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| hannes tiainen Finnish politician (1914-2001), FI (b. 1914) |
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| jorma tiainen Finnish historian, FI (b. 1932) |
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| eila tiainen Finnish politician and journalist, FI (b. 1945) |
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| arja tiainen Finnish author and poet, FI (b. 1947) |
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| pekka tiainen Finnish politician, FI (b. 1951) |
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| marja-leena tiainen Finnish writer, FI (b. 1951) |
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| pertti tiainen Finnish long-distance runner, FI (b. 1954) |
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| juha tiainen athletics competitor, FI (b. 1955) |
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| esa tiainen (b. 1952) |
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| jussi tiainen (b. 1954) |
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| olli tiainen FI (b. 1956) |
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Mr, Sami, Samu, Satu, Saku, Sini, Simo, Suvi, Sole, Alli, Anna, Anne, Anni, Annu, Anja, Arto, Arja, Aksu, Aino, Aija, Aune, Auli, Sari, Sara, Miia, Miko, Ms, Mia, Anu, Ari, Aki, Kai, Kht, Pia, Pã, Tea, Aaro, Nea, Epe, Ira, Ida, Mari, Mark, Make, Meri, Mira, Miro, Mika, Esa, and Beda