Cognomen Aarnio (Aarnio 
, ارنيو) , in the entire world, is quite a rare surname. The surname Aarnio is habitual in Northern Europe, particularly Finland, where it is quite a common surname, Sweden, where it is a rare surname, and Latvia. In absolute terms, this name is the most popular in Finland, the United States, and Sweden. Much less frequently, Aarnio is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Aarnio | Aruba, Sweden, Finland, United States, Denmark |
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matti aarnio Finnish military officer, FI (b. 1901) |
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| bernhard aarnio Finnish geologist, FI (b. 1876) |
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aarne j. aarnio FI (b. 1917) |
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| erland aarnio Finnish architect (b. 1877) |
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| erland aarnio Finnish journalist, FI (b. 1881) |
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eero aarnio Finnish interior designer, FI (b. 1932) |
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aulis aarnio Finnish professor of civil law (University of Helsinki, Univ. of Buenos Aires, Univ. of Lund, Univ. of Minnesota, Cornell Univ. and Univ. of Münster), academy professor (Academy of Finland), author, FI (b. 1937) |
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| kaarle artturi aarnio FI (b. 1879) |
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| hjalmar aarnio (b. 1880) |
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pekka aarnio Finnish singer and record producer (1947-2019), FI (b. 1947) |
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| kyösti aarnio (b. 1888) |
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| reino aarnio American architect (1912-1988), US (b. 1912) |
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| milja aarnio Finnish sculptor, FI (b. 1923) |
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| olavi aarnio FI (b. 1918) |
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| annikki aarnio Finnish sprinter, FI (b. 1929) |
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