Last name Troyan (Троян 
, Troyan 
, Троиан ) , around the world, is a common cognomen. The cognomen Troyan is habitual in Eastern Europe, particularly Ukraine, where it is quite a common surname, Belarus, and Bulgaria, where it is quite a rare surname. Measured by absolute frequency, it is the most numerous in Eastern Europe, particularly Ukraine, Russia, and Belarus. Very seldom, Troyan is the forename as well as the last name.
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troyan ivanov bulgarian revolutionary, MK |
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| sue troyan American women's basketball coach (b. 1965) |
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| sasha troyan (b. 1962) |
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| v. troyan researcher, ORCID id # 0000-0002-5254-4339 |
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| peter gerard troyan Ph.D. Stanford University 2014 |
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| steve troyan college basketball player (1985–1986) Northern Arizona |
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| alexandra s troyan researcher |
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| sergei troyan Russian footballer, RU (b. 1984) |
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