In the (Syriac) Aramaic, “God” is “Aloho” or “Alaho,” which (someone correct me if I’m wrong) comes from the same Semitic roots as “Allah.” Someone once told me it is the same as the biblical “El” - sounds reasonable, but I can’t vouch for it.
Mary, for example, is “Yoldat Aloho,” the Mother of God.
I would expect that “Allah” would be a perfectly acceptable reference to “God” in Arabic, JUST AS LONG AS the user clarifies the difference between the Moslim and Christian understandings of Who God is.
"El" is a contraction of "Elah", which is obviously a cognate of "Alaho" and "Allah".