Beelzebub is the same as Beel or Baal, or Beelphegor. Beel was father of Ninus king of Assyria; Baal was so called because he was worshipped on high; he was called Beelphegor from the mountain Phegor; Zebub was the servant of Abimelech the son of Gedeon, who, having slain his seventy brothers, built a temple to Baal, and set him up as Priest therein, to drive away the flies which were collected there by the abundant blood of the victims; for Zebub means, a fly. Beelzebub therefore is interpreted, The man of flies; wherefore from this most unclean worship they called him the Prince of the daemons. Having therefore nothing more mean to cast upon the Lord, they said that He cast out daemons by Beelzebub. And it should be known that this word is not to be read with d or t at the end, as some corrupt copies have, but with, b.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).