Allah is the proper name for God in the Arabic; both a sacred and Semitic language. Jews, Christians and Muslims all aspire to worship the same One God. Allah says in the Quran:
And do not debate with the People of the Book, unless in the best of manners, except those who are unjust, and say: “We believe in the Revelation that has come down to us and in that which has come down to you; Our God and your God is One, and to Him do we wholly give ourselves.” (Quran 29:46)
The word Allah is a unique term in that it has no plural and it does not carry any gender signification. This divine utterance, Allah, even predates the advent of Prophet Muhammad (peace be upon him) himself and is still used today by both Jewish and Christian Arabs to signify the same one and only God.
He is God, the one whom there is no deity but He; the Knower of the unseen and the apparent; He is the Benevolent, the Merciful.
He is God, the one whom there is no deity but He; the King, the Holy, the Source of All Peace, the Guardian of Faith, the Preserver, the Mighty, the Compeller, the Majestic; Glory be to God, beyond their associations (of partners with Him)!
He is God, the Creator, the Maker, the Fashioner. To Him belong the most beautiful names. All that is in the heavens and the earth magnifies Him, and He is the Mighty, the Wise. (Quran 59:22-24)