From BiblePortal Wikipedia

Hawker's Poor Man's Concordance And Dictionary [1]

So called from Baal, lord, and Zebub, a fly. And this was the ridiculous idol worshipped at Ekron, to whom Ahaziah, king of Israel, sent to enquire concerning his recovery from a fall he had from his terrace. (See  2 Kings 1:2-3) How very sadly this weak prince answered to his name! The man that was called Ahaziah should have had better views of the Lord, Achaz and Jah, meant, vision of the Lord. Whereas, his was a vision of folly! The Egyptians, it should seem, as well as the being near neighbours, paid divine to this contemptible idol. It is possible, the folly of this idolatry might take its rise from the plague of the flies, which Egypt suffered on account of Israel. (See  Exodus 8:20, etc.) But it said also by historians, that the rivers of Egypt abound with flies whose sting is very painful. It is worthy remark, that the name of this idol changed only from Baal-zebub in Hebrew, to Beel-zebub in Greek, was given to the devil, in the days of our Lord's ministry upon earth. It doth not appear that was worshipped at that time; but it is evident so generally known and acknowledged by this name, that the Pharisees made use of it as a well known, and in a daring blasphemy, the miracles of the Lord Jesus to his power (See  Matthew 12:24)

Holman Bible Dictionary [2]

 2 Kings 1:2 Matthew 10:25BaalSatan

Baker's Evangelical Dictionary of Biblical Theology [3]

See Pagan Gods And Goddesses

Easton's Bible Dictionary [4]

 2 Kings 1:2,3,16

Cyclopedia of Biblical, Theological and Ecclesiastical Literature [5]

(Hebrews Ba'al Zebub', בִּעִל זְבוּב Fly-Lord; Sept. [v. r. Ή ] Βάαλ Μυϊ v Αν ) occurs in  2 Kings 1:2-3;  2 Kings 1:16, as the god of the Philistines at Ekron, whose oracle Ahaziah sent to consult. Though such a designation of the god appears to us a kind of mockery, and has consequently been regarded as a term of derision (Selden, De Diis Syris, p. 375), yet there seems no reason to doubt that this was the name given to the god by his worshippers, and the plague of flies in hot climates furnishes a sufficient reason for the designation. See FLY. Similarly the Greeks gave the epithet Ἀπόμυιος , to Zeus (Clem. Alex. Protrept. 2, 38) as worshipped at Elis (Pausan. v. 14, 2), the Myiagrus Deus of the Romans (Solin. Polyhist. 1), and Pliny (29. 6, 34, init.) speaks of a Fly-god Myiodes. As this name is the one used by Ahaziah himself, it is difficult to suppose that it was not the proper and reverential title of the god; and the more so, as Beelzebul ( Βεελζεβούλ ) in  Matthew 10:25, seems to be the contemptuous corruption of it. (See Beelzebub). Any explanation, however, of the symbolical sense in which flies may have been regarded in ancient religions, and by which we could conceive how his worshippers could honor him as the god offlies, would appear to us much more compatible with his name than the only sense which can be derived from the Greek parallel. This receives some confirmation, perhaps, from the words of Josephus (Ant. 9, 2, 1), who says, "Ahaziah sent to the Fly ( Τῆς Μυῖαν ), for that is the name of the god" ( Τῷ Θεῷ ). The analogy of classical idolatry would lead us to conclude that all these Baals are only the same god under various modifications of attributes and emblems, but the scanty notices to which we owe all our knowledge of Syro-Arabian idolatry do not furnish data for any decided opinion on this phasis of Baal. (See Baalim).