Aarnio is a Finnish surname.http://verkkopalvelu.vrk.fi/Nimipalvelu/default.asp?L=1 nimipalvelu It was registered by the Suomalaisuuden Liitto in 1921 and has 2,084 known bearers. Notable people with the surname include:
Eero Aarnio (born 1932), Finnish interior designer Henri Aarnio (born 1993), Finnish badminton player Matti Aarnio (1901–1984), Finnish military officer Reino Aarnio (1912–1988), American architect Tero Aarnio (born 1984), Finnish motorcycle speedway rider
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