From an encyclopaedia I have at home:

"BEL
[from Akkadian, meaning "Owner; Master"].

A Babylonian deity.

The title Bel was first applied to the god Enlil. Bel was part of the original Sumerian triad of deities, along with Anu and Enki (Ea). When Marduk (Merodach) became the chief god of Babylon, he was also given the name Bel.-"

See also
http://www.britannica.com/bcom/eb/article/8/0,5716,15358+1+15167,00.html

The Hebrew prophet Daniel was given the name "Belteshazzar" by his Babylonian captors, if I remember my childhood Bible lessons correctly.