Oinas is an Estonian and Finnish surname meaning "ram" or "wether" (Ovis aries).
Notable people bearing the surname Oinas include:
Aleksander Oinas (1887–1942), Estonian politician Alma Ostra-Oinas (1886–1960), Estonian journalist, writer and politician Asko Oinas (1929–2020), Finnish government official and Governor of Lapland August Oinas (1898–1965), Estonian historian Felix Oinas (1911–2004), Estonian folklorist, linguist, scholar and translator Teuvo Oinas (born 1954), Finnish singer Valdar Oinas (born 1942), Estonian astrophysicist
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