Family name Piirainen (Piirainen 
) , all over the world, is quite a rare cognomen. The last name Piirainen is habitual in Northern Europe, particularly Finland, where it is quite a common surname, Sweden, where it is a rare surname, and Estonia. Not in comparison with a country's population, the name is most common in Finland, the United States, and Sweden.
| jaakko piirainen Finnish politician (1871-1917), FI (b. 1871) |
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| juho piirainen FI (b. 1879) |
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| mikko piirainen Finnish poet, FI (b. 1899) |
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| uuno piirainen FI (b. 1899) |
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| väinö piirainen FI (b. 1907) |
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| ilpo tapani piirainen Finnish linguist and germanist; professor (Westfälische Wilhelms-Universität, Münster, Germany), FI (b. 1941) |
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lasse piirainen FI (b. 1982) |
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| elisabeth piirainen German linguist, DE (b. 1943) |
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| raimo piirainen Finnish politician, FI (b. 1952) |
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| jari piirainen Finnish politician, FI (b. 1960) |
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| matti piirainen FI (b. 1950) |
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| jukka piirainen Finnish sailor, FI (b. 1969) |
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| marko piirainen Finnish politician, FI (b. 1975) |
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| sirpa piirainen researcher |
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| mikko piirainen botanist |
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