He called it Shibah. Therefore the name of the city is Beersheba to this day.
Referenced Verses
Gen 21:31 : 31 Therefore he called that place Beersheba, because they both swore there.
Gen 26:28 : 28 They said, "We saw plainly that Yahweh was with you. We said, 'Let there now be an oath between us, even between us and you, and let us make a covenant with you,