Then Jerubbaal, who is Gideon, and all the people that were with him, rose up early, and pitched beside the well of Harod: so that the host of the Midianites were on the north side of them, by the hill of Moreh, in the valley. Then Jerubbaal, who is Gideon - It appears that Jerubbaal was now a surname of Gideon, from the circumstance mentioned Judges 6:32. See Judges 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.