Last name Koskelainen (Koskelainen 
) , worldwide, is quite a rare cognomen. The last name Koskelainen is characteristic of Northern Europe, particularly Finland, where it is quite a common surname, Estonia, where it is a rare surname, and Sweden. In absolute terms, it is the most numerous in Finland, Australia, and Sweden.
| VARIANT | COUNTRY |
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| Koskelainen | Sweden, Finland, Italy, Switzerland, Australia |
Koski, and Коскелайнен
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yrjö koskelainen Finnish politician and journalist, FI (b. 1885) |
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| aatu koskelainen FI (b. 1849) |
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| osmo koskelainen (b. 1938) |
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| jukka koskelainen Finnish writer, FI (b. 1961) |
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| kari koskelainen FI (b. 1965) |
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| kari koskelainen Finnish floorball player, FI (b. 1982) |
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| riia-rosa koskelainen Finnish swimmer, FI (b. 1987) |
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| johanna koskelainen FI |
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| sini koskelainen FI |
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| henriikka koskelainen FI |
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| jorma koskelainen FI |
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| roope koskelainen FI (b. 1994) |
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Mr, Jari, Jere, Juha, Juho, Jimi, Tomi, Toni, Tero, Timo, Niko, Eija, Eetu, Vili, Vesa, Iiro, Olli, Maria, Marko, Marek, Marjo, Matti, Jani, Lena, Riku, Pyry, Ms, Anu, Aki, Pã, Ted, Nea, Esa, Mari, Manu, Meri, Mairo, Mika, Sami, Satu, Suvi, Anne, Arto, Adam, Aila, Aatu, Kari, Pasi, Sari, and Maija