The word "Allah" is the perfect description of the "One God" of monotheism for Jews, Christians and Muslims!
Is "Allah" only for Islam and Muslims?
[No! It is for All Three Abrahamic Faiths.]
"Allah" is the same word used by Christian Arabs and Jewish Arabs in their Bible, centuries before Islam came.
On page one… (more)  of Genesis in the Old Testament, we find the word "Allah" seventeen  times.
Every hotel and motel has a Bible. Next time you see one look in the introduction, you will find samples of the different languages they have translated. For Arabic they have translated the verse in the New Testament in Arabic from the famous verse in the Gospel John 3:16 -
"For God so loved the world..."
- and the word the translators used in Arabic for "God" is the very same word used by Muslims around the planet, "Allah."
Where Does the word "Allah" Come From?
"Allah" comes from the Arabic word "elah"a god' or something worshiped. - (Arabic) means '
This word (elah) can be made plural (gods), as in "aleha" and it can be male or female just as the word in English can be "goddess."
"Allah" comes from "elaha" but it brings more clarification and understanding.
Allah = Has no gender (not male and not female)
"He" is used only out of respect and dignity - not for gender
Allah = Always singular - Never plural
"We" is used only as the "Royal WE" just as in English for royalty
Allah = Means "The Only One to be Worshipped"
The term is derived from the three consonants root w-h-d, which serves as the vehicle for the basic concept of ‘oneness,’ or ‘unity,