All around the world, Terttu (Terttu 
) is a rare feminine first name. The first name Terttu is characteristic of Finland, where it is quite a rare girly name, Sweden, where it is a rare feminine name, and Germany, where it is a very rare girly name. Not in comparison with a country's population, it is commonest in Finland, Sweden, and the United States. Very seldom, Terttu is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Terttu | Germany, Finland, Spain, Sweden, United States |
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terttu soinvirta Finnish actress (1921-1984), FI (b. 1921) |
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terttu arajärvi Finnish professor of child psychiatry (University of Helsinki), attending physician of Children's Castle (part of Helsinki University Central Hospital), FI (b. 1922) |
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terttu nyman Miss Finland in 1948 and 1949, FI (b. 1928) |
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terttu savola Finnish politician, FI (b. 1941) |
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terttu talonen Finnish dramaturge and producer (1941-2013), FI (b. 1941) |
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| terttu kainuvaara Finnish sprinter and competitive diver (1894-1955), FI (b. 1894) |
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| terttu pajunen-kivikäs Finnish actor (1898-1986), FI (b. 1898) |
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| terttu kätkä Finnish writer, FI (b. 1916) |
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| terttu järvilehto Finnish writer, translator, FI (b. 1918) |
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| terttu eskelinen Finnish writer, translator, FI (b. 1920) |
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| terttu nousiainen Finnish kindergarten teacher, child writer, FI (b. 1922) |
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| terttu tupala Finnish teacher, writer, FI (b. 1924) |
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| terttu rosengren Swedish teacher (1924-2010), SE (b. 1924) |
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| terttu aarnivala Finnish basketball player, FI (b. 1931) |
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| terttu weckström Finnish badminton player, FI (b. 1931) |
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Nen, Riskilä, Ryynänen, Leinonen, Lehtonen, Lehtinen, Lindberg, Tamminen, Tuominen, Niemelä, Hallfors, Heinonen, Virtanen, Voutilainen, Pakarinen, Penttilä, Penttinen, Rautiainen, Revolinsky, Laaksonen, Järvinen, Nevalainen, Peltonen, Heikkilä, Paananen, Koskinen, Fox, Salo, Ojala, Savoie, Alanen, Cordle, Titoff, Mattila, Mikkola, Salonen, Bradlin, Britton, Koskela, Koivisto, Rantala, Grönroos, Latvala, Timonen, Turunen, Mäkinen, Seppänen, Parviainen, and Heikkinen