🔼The name Gederah in the Bible
The name Gederah occurs only once in the Bible. It's the name of a city that came to be situated in the territory allotted to the tribe of Judah. It's possible that the name of this town was Gederah-and-Gederothaim because the "and-Gederothaim"-part is mentioned right after Gederah, and there were supposed to be fourteen towns-and-their-villages but there are fifteen names given (Joshua 15:36).
It's also possible that David's administrative officer Baal-hanan the Gederite (1 Chronicles 27:28) came from this town. Some scholars believe that Gederah is the same as the Canaanite city of Geder, which was conquered by Joshua (Joshua 12:13).
🔼Etymology of the name Gederah
The name Gederah comes from the noun גדרה (gedera), meaning wall:
For a meaning of the name Gederah, NOBSE Study Bible Name List reads Sheepfold (the noun גדרה (gedera) is sometimes interpreted as such; Numbers 32:24). Jones' Dictionary of Old Testament Proper Names proposes A Wall. BDB Theological Dictionary forgoes translating our name but does list it under the noun גדר (gader), meaning wall.