Family name Kettula (Kettula 
) , across the world, is a rare cognomen. The last name Kettula is characteristic of Northern Europe, particularly Finland, where it is quite a rare surname, Estonia, where it is a rare surname, and Sweden. Measured by absolute frequency, the name is most common in Finland, the United States, and Thailand. Very seldom, Kettula is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Kettula | Estonia, Sweden, Finland, United States, Thailand |
| kalle kettula Finnish basketball player and pesäpallo player (1929-2014), FI (b. 1929) |
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| kari juhani kettula Finnish author, FI (b. 1947) |
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| teijo kettula Finnish musician, FI (b. 1958) |
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| akseli kettula FI |
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Mr, Eero, Matti, Milja, Mikko, Salla, Sirae, Susan, Seija, Amber, Caleb, Katja, Kalle, Kaisa, Kirsi, Kimmo, Paula, Robin, David, Leevi, Janne, Tasha, Noah, Niki, Timo, Jimi, Ms, Anu, Amy, Aki, Roy, Dee, Joe, Nea, Mari, Mika, Teemu, Miia, Anne, Arto, Kohl, Ruth, Levi, Luke, Jani, John, Joni, Joel, Sami, and Teppo