Adam Clarke on Judges 1:5

And they found Adoni-bezek - The word מצא matsa, "he found," is used to express a hostile encounter between two parties; to attack, surprise, etc. This is probably its meaning here. Adoni-bezek is literally the lord of Bezek. It is very probable that the different Canaanitish tribes were governed by a sort of chieftains, similar to those among the clans of the ancient Scottish Highlanders. Bezek is said by some to have been in the tribe of Judah. Eusebius and St. Jerome mention two villages of this name, not in the tribe of Judah, but about seventeen miles from Shechem.