Correction: Countries ending in "-stan" (Persian for "land of") are in Central Asia, not the Middle East.
The seven "-stan" nations:
The Middle East (West Asia + Egypt) includes: Saudi Arabia, Iran, Iraq, Israel, Jordan, Lebanon, Syria, Turkey, Yemen, Oman, UAE, Qatar, Bahrain, Kuwait, Cyprus, Palestine. None end in "-stan."
The suffix -stan derives from Old Persian *stāna* ("place, land"), cognate with Sanskrit sthāna and English "stand." It denotes "land of the [people]"—e.g., Kazakhstan = "Land of the Kazakhs."