Adam Clarke on Judges 2:11

Served Baalim - The word בעלים baalim signifies lords. Their false gods they considered supernatural rulers or governors, each having his peculiar district and office; but when they wished to express a particular בעל baal, they generally added some particular epithet, as Baal-zephon, Baal-peor, Baal-zehub, Baal-shamayim, etc., as Calmet has well observed. The two former were adored by the Moabites; Baal-zebub by the Ekronites. Baal-berith was honored at Shechem; and Baal-shamayim, the lord or ruler of the heavens, was adored among the Phoenicians, Syrians, Chaldeans, etc. And whenever the word baal is used without an epithet, this is the god that is intended; and probably, among all these people, it meant the sun.