It's the name of a god or demon.

Beelzebub (more accurately Ba‘al; Zebûb or Ba‘al Zəbûb), appears as the name of a god worshipped in the Philistine city of Ekron. It is later the name of a demon/devil, often interchanged with Beelzebul. Either form may appear as an alternate name for Satan or the Devil or may appear as the name of a lesser devil.
(http://www.e-paranoids.com/b/be/beelzebub.html)

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