What is the origin and meaning of the name Allah?

The origin of the name Allah is from Al-Ilaah, according to the majority of opinion of Muslim Arabic grammarians. However, some did hold that it was a word without root, that it was a fixed word and has no root from which it was derived. That’s another opinion but the majority held that it was from Al-Ilaah and as a meaning we say that it contains in it all of the meanings of the other names of Allah because all of the various grammatical constructions in which the name Allah is mentioned in the Qur’an along with other names of Allah come as further descriptions of Allah. So it means then that all that they contain is contained within the Name Allah just as if we took the name of a person, we said 'Muhammad' then we described him as a carpenter, a father, a politician, a whatever. All the other descriptions that we give are all representing characteristics, which Mohammad has. So similarly when we see the various verses in the Qur'an where Allah mentions, the name Allah first and then after that we see other names coming they are descriptions of the name Allah just as in the Basmalah itself: bismillah Ar- Rahman Ar-Raheem so “In the Name of Allah” and then description of Allah, who is He, Ar- Rahman “the Most Beneficent”, Ar-Raheem “the Most Merciful”. So from that it was concluded that the name Allah contains the meanings of all of the various names.