Adam Clarke on Judges 7:1

Then Jerubbaal, who is Gideon - It appears that Jerubbaal was now a surname of Gideon, from the circumstance mentioned Jdg 6:32. See Jdg 8:35.

The well of Harod - If this was a town or village, it is nowhere else mentioned. Probably, as חרד charad signifies to shake or tremble through fear, the fountain in question may have had its name from the terror and panic with which the Midianitish host was seized at this place.