Galbasi
From Tolkien Gateway
Galbasi is a Hobbitish surname
It was corrupted as Galpsi.
Etymology
The surname that comes from the name of the village Galabas "Gamwich"
The name Galabas uses the elements galap, "game", and bas "village", corresponding somewhat to "-wich" or "-wick".
Translation
The name was translated as "Gammidgy" and the corrupted form as Gamgee.