Globally, Trajan (Trajan 
, Траян 
) is a rare boy's given name. The first name Trajan is characteristic of Bulgaria, where it is quite a rare masculine name, North Macedonia, and Ukraine, where it is a rare boy's name. In absolute terms, it is the most numerous in Bulgaria, Ukraine, and the United States. Likewise, Trajan is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Trajan | Serbia, India, United States, Romania, North Macedonia |
| Траян | Kazakhstan, Russia, Bulgaria, Belarus, Ukraine |
| trajan the patrician Byzantine historian (b. 500) |
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| trajan auersperg (1495-1541) (b. 1495) |
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trajan fugger (1571-1609) (b. 1571) |
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| trajan hughes Dutch artist, active 17th century (b. 1670) |
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| trajan wallis (b. 1794) |
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| turku trajan American sculptor, 1887-1959, US (b. 1888) |
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| trajan popesco French conductor and choir director, FR (b. 1920) |
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trajan langdon American basketball player, US (b. 1976) |
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| trajan ivanovski MK (b. 1917) |
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trajan lakavishki MK |
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| trajan gocevski (b. 1950) |
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| trajan schwartz Dr. phil. Universität Leipzig 1931 |
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| trajan wesley college basketball player (2019–2020) Louisiana |
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| trajan kiril petkovski MK |
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| trajan becker EE |
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