Last name Рудой (Рудой 
, Rudoy 
, Rudoi ) , worldwide, is quite a common family name. The cognomen Рудой is characteristic of Eastern Europe, particularly Belarus, where it is quite a common surname, Moldova, where it is quite a rare surname, and Ukraine. Not in comparison with a country's population, it most frequently occurs in Eastern Europe, particularly Russia, Ukraine, and Belarus. Much less frequently, Рудой is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Рудой | Moldova, Ukraine, Kazakhstan, Belarus, Russia |
| Rudoy | Argentina, Belarus, Brazil, Russia, United States |
| Rudoi | Moldova, Belarus, Brazil, Russia, United States |
| Rudoj | Germany, Belarus |
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рудой, алексей николаевич Russian geographer (1952-2018), RU (b. 1952) |
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| борис захарович рудой UA (b. 1911) |
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| рудой, анатолий михайлович RU (b. 1912) |
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| рудой, григорий яковлевич RU (b. 1919) |
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| рудой, аркадий борисович BY (b. 1934) |
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| рудой, валерий исаевич UA (b. 1940) |
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| рудой, антон владимирович Kazakhstani rugby union player, KZ (b. 1983) |
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| рудой, василий владимирович RU (b. 1974) |
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| андрей рудой politician, RU (b. 1990) |
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| рудой, евгений владимирович RU (b. 1980) |
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