Family name Rahja (Rahja 
) , in all the world, is a rare cognomen. The last name Rahja is characteristic of Finland, where it is quite a rare surname, Switzerland, where it is a very rare surname, and the United States. Not in comparison with a country's population, the name is most common in Finland, the United States, and Indonesia. Very seldom, Rahja is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Rahja | Germany, Finland, Indonesia, India, United States |
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eino rahja Finnish-Russian revolutionary (1885–1936), RU (b. 1885) |
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| jaakko rahja Finnish politician (1872-1926), FI (b. 1872) |
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| timo rahja Finnish association football player, FI (b. 1948) |
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| jaakko rahja FI (b. 1955) |
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| miia rahja researcher ORCID ID = 0000-0003-0845-5459 |
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| mikko rahja FI |
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| jukka rahja FI |
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| marianne rahja FI |
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Mr, Jari, John, Jean, Juho, Tanu, Tatu, Timo, Essi, Eric, Jani, Emma, Maija, Mikko, Myrna, Salla, Saija, Saara, Scott, Alyce, Antti, Ossi, Lisa, Dale, Piia, Ms, Amy, Aki, Bob, Kay, Ken, Pam, Raj, Lee, Tim, Esa, Mary, Mark, Mike, Mika, Sara, Simo, Adam, Aune, Cody, Bill, Kaisa, and Kaija