Family name Koistinen (Koistinen 
, Койстинен 
) , worldwide, is quite a rare surname. The surname Koistinen is habitual in Northern Europe, particularly Finland, where it is quite a common surname, Sweden, where it is quite a rare surname, and Latvia, where it is a rare surname. In absolute terms, this name is the most popular in Finland, the United States, and Sweden.
| VARIANT | COUNTRY |
|---|---|
| Koistinen | Finland, Canada, Sweden, United States, Latvia |
| Койстинен | Russia |
| olli koistinen Finnish historian, FI (b. 1877) |
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| unto koistinen Finnish painter (1917–1994), FI (b. 1917) |
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| tauno koistinen Finnish association football player (1918-1977), FI (b. 1918) |
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| otto koistinen Finnish kantele maker (b. 1925) |
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mari koistinen Finnish writer, journalist, FI (b. 1977) |
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| karl koistinen Swedish architect, SE (b. 1929) |
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| vuokko koistinen Finnish writer, FI (b. 1931) |
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ville koistinen Finnish ice hockey player, FI (b. 1982) |
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| annikki koistinen Finnish politician, FI (b. 1934) |
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matti koistinen Finnish ice hockey player, FI (b. 1986) |
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| keijo koistinen Finnish ice hockey player and association football player (1941-1968), FI (b. 1941) |
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topi koistinen Finnish pesäpallo player, FI (b. 1993) |
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| al koistinen American politician, US (b. 1948) |
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ada koistinen Finnish triple jumper, FI (b. 1999) |
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| ritva koistinen-armfelt Finnish kantele musician, player, FI (b. 1956) |
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