Cognomen Oost (Ost 
, Hostis 
, Oost ) , across the world, is a common last name. The last name Oost is habitual in Suriname, where it is quite a common surname, Belgium, and Netherlands. Measured by absolute frequency, it is the most numerous in Western Europe, particularly Germany, Netherlands, and Belgium. Very seldom, Oost is the forename as well as the last name.
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| Oost, Ost | Germany, Brazil, United States, Netherlands, Belgium |
| Hostis | Brazil, United Kingdom, France, South Africa |
East, Host, Oosten, Oostendorp, Oosterbeek, Oosterveld, Ospel, Oste, and ווסט
| arthur van oost Belgian composer and music teacher, BE (b. 1870) |
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| harm oost South African politician (1877-1964), ZA (b. 1877) |
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| joseph van oost (b. 1877) |
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| johannes jacobus van oost Dutch painter (1917-1975), NL (b. 1917) |
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john van der oost NL (b. 1958) |
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| lily van oost BE (b. 1923) |
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| godfried oost BE (b. 1924) |
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| gert oost Dutch composer and musicologist, NL (b. 1942) |
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| paulette van oost (b. 1945) |
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| georg oost AT (b. 1946) |
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| jan van oost Belgian sculptor, BE (b. 1961) |
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| hans van oost Belgian guitarist, BE (b. 1962) |
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| albert oost Dutch painter, NL (b. 1968) |
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| e.h. oost botanist |
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| pascal oost Netherlands, NL |
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