Family name Zwanch (Zwanch 
) , in all the world, is a very rare last name. The cognomen Zwanch is habitual in the United States, where it is an extremely rare surname, and Argentina.
| VARIANT | COUNTRY |
|---|---|
| Zwanch | Argentina, United States |
| karen virginia zwanch Ph.D. Virginia Polytechnic Institute and State University 2019 |
|