Family name Oinas (Oinas 
, Ойнас 
) , globally, is a rare cognomen. The last name Oinas is characteristic of 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, Sweden, and Kazakhstan. Very seldom, Oinas is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Oinas | Finland, Romania, Sweden, India, United States |
| Ойнас | Ukraine, Russia, Kazakhstan |
| johannes oinas Estonian communist, EE (b. 1896) |
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| august oinas Estonian journalist and historian, EE (b. 1898) |
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teuvo oinas Finnish singer, FI (b. 1954) |
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| asko oinas FI (b. 1929) |
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| valdar oinas Estonian astrophysicist, EE (b. 1942) |
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annamaija oinas Finnish nordic combined skier and ski jumper, FI |
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| janne oinas former Finnish professional footballer, FI (b. 1973) |
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| minna oinas researcher |
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| sanna oinas researcher ORCID ID = 0000-0003-4565-4318 |
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| niina oinas FI |
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| anita oinas FI |
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| janne oinas (b. 1985) |
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| nuppu oinas Finnish singer, musician and social media influencer, FI (b. 1996) |
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Mr, Essi, Eija, Eero, Vili, Maria, Marko, Matti, Mirva, Minna, Mikko, Sanna, Salla, Sirpa, Antti, Aappo, Katja, Kalle, Kaisa, Keijo, Kimmo, Paula, Tiia, Timo, Tero, Toni, Ms, Sue, Anu, Ari, Aki, Eva, Mika, Sara, Sari, Sami, Pekka, Satu, Arto, Kari, Pasi, Piia, Jari, Joni, Jony, Juha, Taru, Tomi, Simo, and Pritt