Iah ( Egyptian: "jˁḥ", Coptic ) is a minor ancient Egyptian moon god who eventually evolves into Khonsu. Iah is said to be a god of both time and fertility. He is most notable for creating the ancient lunar calendar. The word "jˁḥ" simply means "moon". It is also transliterated as "Yah", Yah(w), "Jah", "Jah(w)", "Joh" or "Aah".