Throughout the world, Oleg (Олег 
, Oleg 
, אולג , among others...) is a prevalent male first name. The forename Oleg is habitual in Eastern Europe, particularly Ukraine, where it is a prevalent male name, Russia, where it is a widespread male name, and Moldova, where it is a common male name (explore the name in all countries). Measured by absolute frequency, it most frequently occurs in Russia, Ukraine, and Kazakhstan. Very seldom, Oleg is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Олег | Kazakhstan, Ukraine, Belarus, Russia, Moldova |
| Oleg | United States, Uzbekistan, Israel, Russia, Moldova |
| אולג | Israel |
| Helgi | United Kingdom, Germany, Iceland, Spain, United States |
| Алег | Kazakhstan, Ukraine, Belarus, Kyrgyzstan, Russia |
Oleg is also a name for the fictitious and mythical characters: .
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oleg i of chernigov (1052-1115) (b. 1052) |
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| oleg ii svyatoslavich Prince of Novgorod-Seversk (b. 1137) |
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| oleg i of ryazan nicknamed the Red, ruled the Principality of Ryazan in 1252–1258 (b. 1215) |
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| oleg romanovich of briansk Russian noble (1245-1307) (b. 1245) |
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oleg svátek CZ (b. 1888) |
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oleg václav procházka CZ (b. 1896) |
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oleg vladimirovitch rodomar vukotitch (b. 1900) |
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oleg cassini American fashion designer, FR (b. 1913) |
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oleg bernhard DE (b. 1909) |
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oleg homola Czech literature historian, literary theorist, painter and writer (1921-2001), CZ (b. 1921) |
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oleg chedia Soviet geologist (1923-1998), RU (b. 1923) |
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oleg tozoni electrical engineer (1927-2012), KZ (b. 1927) |
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oleg protopopov Soviet figure skater, CH (b. 1932) |
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| oleg vojtíšek CZ (b. 1882) |
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oleg vidov Soviet/American actor (1943-2017), US (b. 1943) |
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Kim, Borisov, Kovalev, Kiselev, Romanov, Lebedev, Tarasov, Nikitin, Novikov, Fedorov, Baranov, Melnikov, Stepanov, Petrenko, Dmitriev, Nikolaev, Zakharov, Konovalov, Kovalenko, Kuznetsov, Tkachenko, Medvedev, Abramov, Andreev, Smirnov, Belov, Boyko, Popov, Levin, Fomin, Orlov, Kozlov, Pavlov, Petrov, Egorov, Volkov, Frolov, Ivanov, Osipov, Makarov, Morozov, Mironov, Sergeev, Semenov, Sorokin, Sokolov, Shevchenko, and Bondarenko