Family name Demertzis (Demertzis 
) , globally, is quite a rare cognomen. The surname Demertzis is habitual in Greece, where it is quite a common surname, Australia, where it is a rare surname, and Belgium, where it is a very rare surname. In absolute terms, it is the most numerous in Greece, the United States, and Germany.
| VARIANT | COUNTRY |
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| Demertzis | Germany, Italy, Australia, United States, Greece |
| maria demertzis Economist (Bruegel) |
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| stefanos demertzis researcher ORCID ID = 0000-0002-3796-1775 |
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| nikolaos demertzis researcher |
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| zachary d demertzis researcher |
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Mr, Simon, Steve, Athan, Cathy, Costa, Kathy, Kimon, Panos, Peter, Poppy, Roula, David, Louis, James, Jimmy, Tasos, Tolis, Nikol, Nikos, Elena, Eleni, Sakis, Sarah, Minas, Zach, Ben, Kim, Lee, Jon, Eva, Zoe, Bill, Keli, Pete, Pela, Ester, Dean, John, Joao, Jean, Elli, Erin, Evie, Hope, Faye, Ioan, Yean, Dora, and Effie