Last name Троян (Trojan 
, Троян 
, Troyan ) , around the world, is a common surname. The cognomen Троян is habitual in Eastern Europe, particularly Czechia, where it is quite a common surname, Ukraine, and Belarus. Measured by absolute frequency, the name is most common in Eastern Europe, particularly Ukraine, Russia, and Czechia. Very seldom, Троян is the forename as well as the last name.
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| Trojan | Germany, Czechia, United States, Poland, Brazil |
| Троян | Kazakhstan, Russia, Belarus, Bulgaria, Ukraine |
| Troyan | Germany, Czechia, Bulgaria, United States, Brazil |
| Troian | Czechia, Italy, United States, Poland, Brazil |
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троян, иван иванович RU (b. 1901) |
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| троян, иван семёнович Soviet military personnel, BY (b. 1896) |
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микола петрович троян UA (b. 1942) |
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троян, вадим анатольевич Ukrainian military personnel, UA (b. 1979) |
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| троян михайло васильович UA (b. 1923) |
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| троян олександр іванович UA (b. 1930) |
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| вера михайловна троян UA (b. 1940) |
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| троян, юрий антонович BY (b. 1950) |
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| троян марія семенівна UA (b. 1958) |
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| троян радулов Bulgarian footballer, BG (b. 1974) |
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| александр юрьевич троян researcher ORCID ID = 0000-0002-8926-8921, RU |
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| елена викторовна троян RU (b. 1974) |
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Ян, Дина, Дима, Діна, Надя, Неля, Нина, Ніна, Ніно, Ніла, Вера, Вова, Влад, Віта, Віра, Зіна, Лада, Лена, Леся, Лора, Ліна, Ліза, Дар'Я, Люба, Петр, Гліб, Аня, Ада, Аза, Зоя, Оля, Ева, Яна, Юра, Єва, Катя, Кира, Кіра, Макс, Майя, Марк, Алла, Алім, Алсу, Анна, Адам, Аїда, Гнат, and Люся