Cognomen Mihelj (Mihelj 
) , in all the world, is a rare last name. The last name Mihelj is habitual in Slovenia, where it is quite a common surname, Croatia, where it is quite a rare surname, and Argentina, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Mihelj | Croatia, Italy, France, Slovenia, Argentina |
| črtomir mihelj SI (b. 1946) |
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| tatjana mihelj Slovene singer, SI (b. 1973) |
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| ernest mihelj researcher (ORCID 0000-0002-6080-2553) |
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| matjaž mihelj SI (b. 1973) |
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| sabina mihelj SI (b. 1975) |
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| jernej mihelj SI |
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Mr, Marta, Marko, Matej, Mabel, Maša, Mojca, Mirko, Anica, Borut, Braco, Brian, Bruno, Karlo, Katja, Paula, Paolo, Peter, Petja, Dario, Darko, Davor, Mario, Maria, Ivan, Ines, Ms, Ana, Rok, Tea, Ema, Eva, Iva, Mark, Maja, Maã, Janko, Mira, Sara, Sven, Anja, Luca, Luka, Nina, Erik, Emil, Hugo, Vito, Miha, and Josip