Globally, Trefzer (Trefzer 
) is an extremely rare unknown gender first name. Much more frequently, Trefzer is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Trefzer | Spain, Switzerland, Liechtenstein, United States, Germany |
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