Bel-Merodach was the Babylonian god of the sun, and there are several synonyms used to refer to him in ancient texts. One synonym is "Marduk," which was a popular name for the god in the Assyrian Empire. Another name used for Bel-Merodach is "Baal," which was a common Semitic term used to refer to gods in the ancient Near East. Additionally, Bel-Merodach was sometimes called "Bel," which means "Lord" in Babylonian. "Nabu" was another synonym used for this deity in some texts, which was the name of one of his sons who was also a god of wisdom and writing.