Last name Trefzer (Trefzer 
) , globally, is quite a rare cognomen. The surname Trefzer is habitual in Western Europe, particularly Liechtenstein, where it is quite a common surname, Switzerland, where it is quite a rare surname, and Germany, where it is a rare surname. Not in comparison with a country's population, it most frequently occurs in Germany, Switzerland, and the United States.
| VARIANT | COUNTRY |
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| Trefzer | Germany, Spain, Switzerland, Liechtenstein, United States |
| johann heinrich trefzer BE (b. 1642) |
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| adolf trefzer 19th century German civil servant (b. 1857) |
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| friedrich wilhelm trefzer (1863-1926), CH (b. 1863) |
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martin trefzer DE (b. 1969) |
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| siegfried trefzer (b. 1957) |
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| martin a trefzer researcher ORCID ID = 0000-0002-6196-6832 |
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Mr, Keven, Klaus, Peter, Ricky, David, Diana, Janet, Jorge, Joerg, Jenny, Juerg, Jürg, Jörg, Tracy, Elana, Ernie, Ernst, Eugen, Ewald, Heinz, Heidi, Karin, Bruno, Susie, Sarah, Ms, Amy, Kai, Jan, Tim, Ian, Mike, Alex, Anat, Anne, Horst, Axel, Paul, Rolf, Rick, Davi, Timo, Nina, Hans, Otto, Manni, Mirko, Karl, and Frank