Family name Trefalt (Trefalt 
) , throughout the world, is a rare last name. The family name Trefalt is characteristic of Slovenia, where it is quite a rare surname, Austria, where it is a rare surname, and Croatia. In absolute terms, the name is most common in Slovenia, Austria, and Germany.
| VARIANT | COUNTRY |
|---|---|
| Trefalt | Germany, Austria, Australia, Croatia, Slovenia |
| franc trefalt SI (b. 1903) |
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| mito trefalt SI (b. 1939) |
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| uroš trefalt SI (b. 1965) |
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| gregor trefalt researcher ORCID ID = 0000-0002-6429-8630 |
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| gregor trefalt SI |
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