Family name Trofast (Trofast 
) , all around the world, is a very rare last name. The last name Trofast is habitual in Sweden, where it is a rare surname, Finland, and New Zealand, where it is a very rare surname. Measured by absolute frequency, it is the most numerous in Sweden, Finland, and the United States.
| VARIANT | COUNTRY |
|---|---|
| Trofast | Sweden, Finland, United States, Brazil, New Zealand |
| alf trofast SE |
|