Worldwide, Kaloyan (Kaloyan 
, Калоян 
, קיסר) is quite a rare boy's given name. The first name Kaloyan is habitual in Bulgaria, where it is quite a common masculine name, Cyprus, where it is quite a rare boy's name, and Greece, where it is a rare masculine name. Measured by absolute frequency, it is the most numerous in Bulgaria, Greece, and Italy. Very seldom, Kaloyan is the last name as well as the forename.
| kaloyan kopchev Bulgarian association football player, BG (b. 1975) |
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| kaloyan marinov Ph.D. University of Washington 2015 |
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| kaloyan kamenov researcher |
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| kaloyan slavov Ph.D. Massachusetts Institute of Technology 2011 |
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| kaloyan velkov victim of far-right hate crime in Germany killed in 2020, DE |
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| kaloyan m tsanov researcher |
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| kaloyan takov researcher |
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| kaloyan georgiev researcher ORCID ID = 0000-0003-1839-1452 |
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| kaloyan pishmanov actor |
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| kaloyan ivanov US entomologist, US |
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| kaloyan tsochev researcher |
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| kaloyan petrov researcher |
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| kaloyan boyadjiev (b. 1977) |
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| kaloyan cvetkov Bulgarian footballer, BG (b. 1988) |
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| kaloyan tsvetkov Bulgarian footballer, BG (b. 1988) |
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Koev, Kanchev, Kamenov, Kirilov, Krastev, Ganchev, Lazarov, Todorov, Nikolov, Hristov, Vasilev, Mihaylov, Simeonov, Stefanov, Stoyanov, Stoychev, Atanasov, Dimitrov, Georgiev, Tsvetkov, Yordanov, Kaloyanov, Borisov, Angelov, Mirchev, Marinov, Kanev, Kolev, Kosev, Kirov, Penev, Popov, Dimov, Ganev, Tanev, Iliev, Kostadinov, Yanev, Kostov, Krumov, Pavlov, Petrov, Petkov, Dobrev, Tsonev, Nachev, Ivanov, Yankov, Stanev, and Aleksandrov