I was going to post something by Dr. Morrey but since muslims don't agree with him found another site.
http://www.absoluteastronomy.com/encyclopedia/a/al/allah.htm
"Allah" as a word
Although the name "Allah" is most commonly associated with (The monotheistic religion of Muslims founded in Arabia in the 7th century and based on the teachings of Muhammad as laid down in the Koran)
Islam, it was also used in pre-Islamic times. It was used by Arab Christians in the pre-Islamic (Click link for more info and facts about Umm al-Jimal inscription)
Umm al-Jimal inscription (6th century). The father of (Leader of Black Muslims who campaigned for independence for Black Americans (1897-1975))
Muhammad, Islam's prophet, had the name "Abdullah", which translates "servant of Allah". The (The ancient Canaanitic language of the Hebrews that has been revived as the official language of Israel)
Hebrew word for deity, (Angular distance above the horizon (especially of a celestial object))
El (אל

or Eloh (אלוה

, was used as an (The collection of books comprising the sacred scripture of the Hebrews and recording their history as the chosen people; the first half of the Christian Bible)
Old Testament synonym for (A name for the God of the Old Testament as transliterated from the Hebrew consonants YHVH)
Yahweh (יהוה

. The (A Semitic language originally of the ancient Arameans but still spoken by other people in southwestern Asia)
Aramaic word for God is
alôh-ô