- As a German surname, from Gast (“guest”) (see below).
- As an Alemannic German surname, shortened from the personal Germanic names Arbogast and Gastolf.
- As a French surname, from Old French gast (“wasteland”).
Gast (plural Gasts)
- A surname.
From Middle High German gast, from Old High German gast. From Proto-Germanic *gastiz, from Proto-Indo-European *gʰóstis (“stranger, guest, host, someone with whom one has reciprocal duties of hospitality”). Cognate with English guest.
Gast is one of the few German masculine nouns referring to human beings that has no feminine equivalent. Gast is used for both male and female guests.