Allah (Arabic: الله Allāh, is the Arabic word for God (al ilāh, literally "the God"). The word has cognates in other Semitic languages, including Elah in Aramaic, ʾĒl in Canaanite and Elohim in Hebrew.
It is used mainly by Muslims to refer to God in Islam, but it has also been used by Arab Christians since pre-Islamic times. It is also often, albeit not exclusively, used by Bábists, Bahá'ís, Indonesian and Maltese Christians, and Mizrahi Jews. Christians and Sikhs in West Malaysia also use and have used the word to refer to God. This has caused political and legal controversies there as the law in West Malaysia prohibits non-Islamic uses of the word. [https://en.wikipedia.org/wiki/Allah]
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 & humanity]
"Allah" is the same word used by Christian Arabs and Jewish Arabs in their Bible, centuries before Islam came.
On page one  of Genesis in the Old Testament [Arabic], 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"
Is there evidence God Exists?What proof is there?Where is God?What is the Origin of God?Does God have limitations?Why did God create everything?Did God create evil too?Does God know future?Why so many religions?Can we prove Quran is from God?Why does Quran say, "We & He"?God of the Jews and Christians?Will all of us be treated equally?