Cognomen Janhonen (Janhonen 
) , in the world, is a rare family name. The family name Janhonen is characteristic of Finland, where it is quite a rare surname, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
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| Janhonen | Finland, United States |
| toivo janhonen Finnish politician (1886-1939), FI (b. 1886) |
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| herbert janhonen (b. 1888) |
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| kristiina janhonen researcher (ORCID 0000-0002-2525-8994) |
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| matti janhonen |
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| esko janhonen FI |
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| matti a janhonen FI |
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Mr, Ulla, Marko, Merja, Milla, Minna, Mikko, Sanna, Salla, Saara, Saana, Seppo, Antti, Katja, Kaisa, Kelly, Kirsi, Paula, David, Laura, Lauri, Lassi, Ossi, Iina, Inka, Heli, Ms, Anu, Kia, Mari, Mika, Sami, Anna, Anne, Armi, Bird, Janne, Kari, Pyry, Riku, John, Joel, Juha, Tomi, Turo, Emma, Eero, Eetu, Pasi, and Jenni