Is bezebul the devil?

Beelzebul or Beelzebub. This is a name derived from Ba'al Zebûb which means literally "Lord of the Flies". In christian and biblical sources he is a demon and is one of the seven princes of Hell. So in actuality he is not the devil himself, but a demon.

"The scribes who had come from Jerusalem said, 'He (Jesus) is possessed by Beelzebul,' and 'By the prince of demons he drives out demons.' - Mark 3:22

"Some of them said 'By the power of Beelzebul, the prince of demons, he drives out demons." - Luke 11:15