Cognomen Östbye (Östbye 
) , across the world, is a very rare family name. The surname Östbye is habitual in Northern Europe, particularly Sweden, where it is a rare surname.
| erik östbye Swedish athletics competitor (1921-2011), SE (b. 1921) |
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| gunlaug östbye Swedish architect and journalist, SE (b. 1932) |
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| gudrun östbye Swedish actress, SE (b. 1934) |
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| henrik östbye researcher |
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