Cognomen Simojoki (Simojoki 
) , around the globe, is a rare surname. The surname Simojoki is habitual in Finland, where it is quite a rare surname, Australia, where it is a very rare surname, and Costa Rica. Measured by absolute frequency, it most frequently occurs in Finland, Australia, and Germany.
| VARIANT | COUNTRY |
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| Simojoki | Costa Rica, Australia, Finland, Germany, Brazil |
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elias simojoki Finnish priest and politician (1899-1940), FI (b. 1899) |
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martti simojoki Finnish archbishop, FI (b. 1908) |
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kaarlo simojoki Finnish military personnel, FI (b. 1913) |
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| aukusti simojoki Finnish journalist, teacher, writer, translator and lyricist (1882-1959), FI (b. 1882) |
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| heikki simojoki Finnish hydrologist, professor of geophysics (University of Helsinki), FI (b. 1906) |
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pekka simojoki Finnish composer, lyricist, arranger and singer, FI (b. 1958) |
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| niilo simojoki FI (b. 1910) |
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| aili simojoki FI (b. 1913) |
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| juhani simojoki Finnish priest and journalist, FI (b. 1928) |
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| anssi simojoki Finnish priest (1944-2020), FI (b. 1944) |
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| heli simojoki researcher |
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| asko simojoki researcher |
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| henrik simojoki DE (b. 1975) |
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