Allah is an Arabic term that means "the god." It was used by Arabic speakers to refer to the supreme deity in several Earth religions, including Judaism, Deism, Christianity, and Islam, and in metaphors that characterized the universe as "God."
United Earth Interior Minister Haroun al-Rashid invoked the term upon learning that the Klingon Empire was not responsible for the attacks in Draylax in 2155. (ENT novel: Kobayashi Maru)
Prylar Hon Avid mentioned an Allah in his memorial homily following the Borg Invasion of 2381. (ST novel: A Singular Destiny)