Last name Debelak (Debelak 
) , around the globe, is a rare cognomen. The last name Debelak is habitual in Slovenia, where it is quite a common surname, Croatia, where it is a rare surname, and Austria. Not in comparison with a country's population, it is the most numerous in Slovenia, the United States, and Australia.
| VARIANT | COUNTRY |
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| Debelak | Australia, Austria, Germany, United States, Slovenia |
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janko debelak SI (b. 1868) |
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| marjan debelak SI (b. 1930) |
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| matjaž debelak ski jumper, SI (b. 1965) |
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| janez debelak SI (b. 1968) |
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| kenneth debelak chemical/biomolecular engineer |
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| rudolf debelak researcher |
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| brane debelak SI |
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| martin debelak SI |
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| marta karlovšek-debelak SI |
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| franci debelak SI |
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| marija debelak SI |
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| bostjan debelak SI |
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| tilen debelak Slovenian alpine skier, SI (b. 1991) |
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| slavko debelak SI |
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Mr, Bret, Bill, Blaz, Kane, Kyle, Paul, Ryan, Dana, Dale, Dawn, Doug, Duã, Greg, Gina, Lisa, Lori, Jack, Josh, John, Joan, Joey, Sara, Sala, Miha, Mike, Ms, Al, Mae, Sue, Amy, Ken, Pat, Pam, Ron, Rok, Judy, Don, Jan, Jon, Joe, Jim, Eva, Mary, Mark, Matt, Maja, Meta, Guy, and Tana