Cognomen Gmach (Gmach 
) , all over the world, is quite a rare family name. The last name Gmach is habitual in Tunisia, where it is quite a rare surname, Germany, where it is a rare surname, and Austria. In absolute terms, it is commonest in Germany, Brazil, and Tunisia. Much less frequently, Gmach is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Gmach | Germany, Tunisia, Brazil, Poland, United States |
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jacqueline semha gmach American historian, US (b. 1940) |
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| gertlieb gmach DE (b. 1944) |
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| oliver gmach researcher (ORCID 0000-0003-2247-5907) |
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| xaver gmach |
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| morgana gmach Brazilian rhythmic gymnast, BR (b. 1994) |
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| alaeddine gmach Tunisian association football player, TN (b. 1995) |
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| mayra de fatima gmach Brazilian rhythmic gymnast, BR (b. 1996) |
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Mr, Gary, Greg, Lara, Lisa, Lois, Luiz, Luan, Jose, John, Joao, Joel, Jean, Judy, Todd, Elda, Hans, Ines, Ilan, Ilza, Igor, Iara, Ryan, Iheb, Regi, Kaua, Ms, So, Ali, Ana, Ann, Amy, Ben, Pat, Gal, Tom, Ivo, Mari, Mary, Mark, Sami, Slim, Anna, Adao, Atef, Cari, Crcp, Kurt, and Orit