Beelzebub
Concise Oxford English Dictionary © 2008 Oxford University Press:
Beelzebub /bɪˈɛlzɪbʌb/
▶noun a name for the Devil.
– origin from late L. Beëlzebub, translating Heb. ba‘al zĕḇūḇ ‘lord of flies’, the name of a Philistine god, and Gk Beelzeboul ‘the Devil’.
'Beelzebub' also found in these Oxford entries:

