Cognomen Kastelic (Kastelic 
) , around the globe, is quite a rare family name. The cognomen Kastelic is habitual in Southern Europe, particularly Slovenia, where it is a common surname, Serbia, where it is quite a rare surname, and North Macedonia, where it is a rare surname. In absolute terms, it is the most numerous in Slovenia, the United States, and Serbia. Much less frequently, Kastelic is the forename as well as the last name.
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| Kastelic | Slovenia, Canada, United States, Serbia, Argentina |
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miha kastelic Slovene librarian, edtor and poet (1796-1868), SI (b. 1796) |
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| anton kastelic SI (b. 1769) |
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jože kastelic SI (b. 1898) |
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| jacob kastelic Austrian military personnel (1897-1944), AT (b. 1897) |
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| josip kastelic AR (b. 1898) |
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| jože kastelic SI (b. 1913) |
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| vinko kastelic SI (b. 1914) |
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| ivan kastelic SI (b. 1920) |
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toni kastelic gymnast, SI |
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| lojze kastelic SI (b. 1923) |
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| olga kastelic-marjetka SI (b. 1924) |
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| katarina kastelic SI (b. 1928) |
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| jure kastelic Slovene athletics coach (1946-2020), SI (b. 1946) |
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| karlo kastelic politician, SI (b. 1954) |
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| dušan kastelic SI (b. 1944) |
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