Surname Kainu (Kainu 
) , all around the world, is a rare cognomen. The last name Kainu is characteristic of Finland, where it is quite a rare surname, Denmark, where it is a rare surname, and Nigeria, where it is a very rare surname. Measured by absolute frequency, it is commonest in Finland, Nigeria, and the United States. Likewise, Kainu is the forename as well as the last name.
| pekka kainu Finnish footballer, FI (b. 1979) |
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| annette kainu researcher |
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| tommi kainu researcher |
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| petteri kainu FI |
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| lasse kainu FI |
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| keijo kainu FI |
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