Arabic was a major language of the Earth region the Middle East.
Islamic liturgy was traditionally recited in Arabic, even among non-native speakers such as Jaleh Khoroushi, a Farsi-speaking Iranian. (Bait and Switch: "Solaere ssiun Hnaifv'daenn")
Krall, son of K'Bron thought that Arabic sounded somewhat similar to tlhIngan Hol. (The War of the Masters: "For We Should Grow Too Fond of It, Part I")