Cognomen Plaan (Plaan 
) , globally, is a rare family name. The cognomen Plaan is habitual in Northern Europe, particularly Estonia, where it is quite a common surname.
| oskar plaan Estonian veterinary scientist, EE (b. 1910) |
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| kuno plaan Estonian confectioner, EE (b. 1930) |
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joonas plaan Estonian environmental anthropologist, EE (b. 1983) |
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| enn plaan Estonian economist, EE (b. 1942) |
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