Cognomen Haapakoski (Haapakoski 
) , throughout the world, is quite a rare surname. The family name Haapakoski is characteristic of Finland, where it is quite a common surname, Australia, where it is a very rare surname, and Canada. Measured by absolute frequency, it is the most numerous in Finland, the United States, and Australia.
| VARIANT | COUNTRY |
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| Haapakoski | Australia, Norway, Finland, Canada, United States |
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ilmari haapakoski Finnish illustrator and military officer (1893-1929), FI (b. 1893) |
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aarne haapakoski Finnish writer, FI (b. 1904) |
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| kalle haapakoski Finnish journalist (1867-1917), FI (b. 1867) |
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sami haapakoski Finnish pesäpallo player, FI (b. 1982) |
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| toivo haapakoski FI (b. 1926) |
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| tapani haapakoski Finnish pole vaulter, FI (b. 1953) |
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| mikko haapakoski Finnish ice hockey player, FI (b. 1967) |
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| antti haapakoski athletics competitor, FI (b. 1971) |
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| paula haapakoski Finnish orienteer, FI (b. 1977) |
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| marko haapakoski researcher ORCID ID = 0000-0003-0901-6319 |
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| sofia haapakoski Finnish association football player, FI |
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| isa haapakoski Finnish association football player, FI |
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| kaisa haapakoski FI |
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| heikki haapakoski FI |
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| liisa haapakoski FI |
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Mr, Pasi, Piia, Rami, Riku, Dani, Jani, Jami, Jari, Jake, John, Joel, Juha, Juho, Tomi, Toni, Tero, Timo, Tiia, Niko, Ella, Essi, Paul, Panu, Kata, Kati, Ms, Mia, Anu, Ari, Pia, Pã, Roy, Htm, Mari, Mike, Erik, Mika, Sara, Sari, Sami, Satu, Sasu, Sini, Anna, Anne, Anni, Arto, Miia, and Erin