Last name Ostan (Osten 
, Ostan 
, Остан 
) , in the world, is quite a common cognomen. The surname Ostan is characteristic of Slovenia, where it is quite a rare surname, Philippines, and Germany. In absolute terms, it is commonest in Philippines, Germany, and the United States. Much less frequently, Ostan is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Osten | Germany, Zimbabwe, Philippines, United States, Brazil |
| Ostan | Turkey, Italy, Philippines, United States, Brazil |
| Остан | Uzbekistan, Armenia, Russia, Kyrgyzstan, Ukraine |
|
boris ostan SI (b. 1960) |
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| izidor ostan SI (b. 1911) |
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| renata ostan person identified in the Museu da Pessoa collection |
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| rita ostan researcher |
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| majda toplak-ostan SI |
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| iztok ostan SI |
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| aleksander ostan SI |
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