Family name Petäjäniemi (Petäjäniemi 
) , in the entire world, is a very rare last name. The surname Petäjäniemi is habitual in Northern Europe, particularly Finland, where it is a rare surname, and Sweden.
| VARIANT | COUNTRY |
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| Petäjäniemi | Sweden, Finland |
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eero petäjäniemi Finnish journalist, FI (b. 1907) |
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tuulikki petäjäniemi Finnish politician, FI (b. 1942) |
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| kirsti petäjäniemi Finnish scriptwriter and director, FI (b. 1942) |
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| tiitus petäjäniemi Finnish painter, FI (b. 1983) |
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| juho-pekka petäjäniemi Finnish rower, FI (b. 1986) |
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| joonas petäjäniemi Finnish rower, FI (b. 1988) |
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| aapo petäjäniemi FI |
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| marjo petäjäniemi FI |
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