(a wall), a place just without the eastern border of Egypt. Shur is first mentioned in the narrative of Haggar’s flight from Sarah (Genesis 16:7). Abraham afterward “dwelled between Kadesh and Shur, and sojourned in Gerar” (Genesis 20:1). It is also called Ethami. The wilderness of Shur was entered in the Israelites after they had crossed the Red Sea (Exodus 15:22-23). It was also called the wilderness of Etham (Numbers 33:8). Shur may have been a territory town east of the ancient head of the Red Sea, and from its being spoken of as a limit, it was probably the last Arabian town before entering Egypt.
Smith's Bible Names Dictionary (1866)