Cognomen Kustec (Kustec 
) , all around the world, is a rare family name. The surname Kustec is habitual in Southern Europe, particularly Slovenia, where it is quite a rare surname, Bosnia and Herzegovina, and Croatia. Very seldom, Kustec is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Kustec | Bosnia and Herzegovina, Croatia, Slovenia, Canada, Argentina |
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simona kustec political scientist and politician, SI (b. 1976) |
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| nada birko kustec Yugoslav cross-country skier, HR (b. 1931) |
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| tanja kustec SI (b. 1978) |
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| aleksander kustec SI |
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| dunja kustec |
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| klavdija kustec SI |
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Mr, Peter, David, Davor, Laura, Tanya, Vilko, Filip, Ivana, Iztok, Karlo, Žiga, Martin, Mateja, Matevz, Mihael, Simona, Sergio, Andrew, Andrej, Carlos, Marija, Borna, Boris, Allie, Ms, Joe, Mary, Maja, Stan, Alen, Kaja, Ryan, Lana, Luka, John, Juan, Neza, Ivan, Olga, Maria, Matej, Mirta, Mirko, Sindi, Steve, Boštjan, and Robert