Cognomen Paajanen (Paajanen 
) , all around the world, is quite a rare last name. The last name Paajanen is characteristic of Northern Europe, particularly Finland, where it is quite a common surname, Sweden, where it is a rare surname, and Estonia. Measured by absolute frequency, it is commonest in Finland, the United States, and Sweden.
| VARIANT | COUNTRY |
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| Paajanen | Sweden, Finland, United States, Canada, Germany |
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paavo paajanen Finnish soldier (1917-1999), FI (b. 1917) |
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| juhani paajanen Finnish politician, FI (b. 1947) |
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| reijo paajanen Finnish politician, FI (b. 1950) |
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| manu paajanen FI (b. 1941) |
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| vilho paajanen (b. 1946) |
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| jukka paajanen (b. 1956) |
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| mikko pasi tapani paajanen researcher |
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| teemu paajanen researcher |
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| jonna paajanen Finnish association football player, FI |
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| pirita maria paajanen D.Phil. University of Oxford 2005 |
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| pirita paajanen researcher |
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| hannu paajanen researcher (ORCID 0000-0003-4370-2590) |
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| juuso paajanen researcher |
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| antti paajanen researcher ORCID ID = 0000-0002-4250-6363 |
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| jyrki paajanen Finnish floorball player, FI (b. 1980) |
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