Cognomen Trojan (Trojan 
, Троян 
) , in all the world, is a common family name. The last name Trojan is characteristic of Eastern Europe, particularly Czechia, where it is quite a common surname, Ukraine, and Belarus. Measured by absolute frequency, it is commonest in Eastern Europe, particularly Ukraine, Russia, and Czechia. Much less frequently, Trojan is the forename as well as the last name.
| trojan de saintes Bishop of Saintes, FR (b. 450) |
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| trojan gundulić Serbian printer and mercchant (b. 1500) |
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| trojan nigellus z oskořína Czech humanist, CZ (b. 1537) |
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alois pravoslav trojan Czech member of Czech council, local politician, notary, mayor and lawyer, CZ (b. 1815) |
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johannes trojan writer and opinion journalist (1837-1915), DE (b. 1837) |
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františek trojan Czech member of Czech council, manager and educator, CZ (b. 1853) |
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| františek břetislav trojan (1816-1889), CZ (b. 1816) |
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| emanuel trojan Austrian architect (1820 - 1893), CZ (b. 1820) |
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| johannes trojan botanist (1837-1925) (b. 1837) |
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stanisław trojan Officer of the Polish Army, PL (b. 1894) |
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václav trojan Czech music educator and composer (1907-1983), CZ (b. 1907) |
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| boleslav trojan CZ (b. 1850) |
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| jan trojan CZ (b. 1857) |
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| eugenie von trojan AT (b. 1862) |
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| alois trojan CZ (b. 1864) |
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