Cognomen Trefall (Trefall 
) , all over the world, is a very rare last name. The cognomen Trefall is characteristic of Norway, where it is quite a rare surname, and Poland, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Trefall | Norway, Poland |
| harald trefall Norwegian physicist and politician (1925-2008), NO (b. 1925) |
|