Beersheba means in the bible: The well of the oath. Abraham Gen. 21.31; Isaac 26.23 and Jacob 28.10. This is the home of Abraham. It was named after Abraham’s covenant with Abimelech (king of Gerar 21.31). Later, it was in Simeon Josh. It was considered the southern limit for Israel Judg at 19:2. 20:1; 1 Sam. 3:20. It was home to a lot of rich pastureland.
(in Bible Dictionary)