Allah

From RationalWiki

There is a broader, perhaps slightly less biased, article on Wikipedia about Allah

Allah (الله) is the Arabic word for God. The word Allah derives from two root words: "Al" meaning "the" and "Illah" meaning God (the same God as "El" in Canaanite religion). A common misconception is that "Allah" is the name of the Muslim God. In fact, Muslims hold that Allah is the God of Abraham, the same God worshiped by Jews and Christians, who they claim created the universe and will be the judge of Man on the Day of Judgment. Indeed, Arabic speaking Jews and Christians refer to God as "Allah" and use the word "Allah" in their holy texts. For further proof, there's an Islamic tradition that the longer version of "Allah" is "Allahummah," which is an obvious cognate with the Hebrew "Elohim," that's used in the Hebrew Bible.

Allah is also likely the name of an eariler deity (probably the creator god) from the polytheistic pre-Islamic religions in or around Mecca. Many scholars hold to a theory that both YHWH of the Israelite (proto-Judaism) religion and Allah of the Meccan religion changed over time, eventually becoming the monotheistic god.