Family name Dejaco (Dejaco 
) , across the world, is a rare surname. The family name Dejaco is characteristic of Liechtenstein, where it is quite a rare surname, Austria, and Italy, where it is a rare surname. Not in comparison with a country's population, it is the most numerous in Austria, Italy, and the United States.
| VARIANT | COUNTRY |
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| Dejaco | Germany, Italy, Austria, Switzerland, United States |
| walter dejaco Austrian architect, AT (b. 1909) |
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| beate dejaco badminton player, IT (b. 1969) |
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| karin dejaco badminton player, IT (b. 1972) |
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| daniel dejaco researcher |
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| beate dejaco researcher |
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| christian dejaco researcher (b. 1980) |
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| clemens dejaco researcher ORCID ID = 0000-0002-4236-6700 |
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| robert f dejaco researcher |
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Mr, Judee, Tomas, Elena, Emily, Vicki, Frani, Irene, Martin, Martha, Julie, Margit, Stefan, Albert, Andrew, Ariana, Carrie, Carmen, Curtis, Robert, Gustav, Manuel, Joann, Laura, Donna, Ana, Amy, Mark, Andy, Anna, Arno, Pire, Ruth, Lisa, Lynn, John, Norb, Hans, Maria, Mario, Sally, Kathy, Peggy, Renee, Diego, Donae, Gregor, and Laurin