Complex sentence: Unlike other places of the name it does "not" mean "eastern farm or village", but is from Old English "tun" "farm, village, estate" with an uncertain first element.
Split into simpler sentences: Unlike other places of the same name the village's name does "not" mean "eastern farm or village". Aston's name instead originates from the Old English words "tun" "farm, village, estate" with an uncertain first element.