There is a place in Israel called Be-er-Sheva', which is given two different stories to justify the name. The word Be-er means well, as in a well of water, and the word Sheva means "seven" or more stretchingly "oath", depending on context. So this is either "well seven" or "well of the oath", both reasonable etymologies.
But Genesis 26:31 gives a story for the etymology:
And they arose early in the morning, and they swore, man to his brother, and Isaac sent them, and they walked from him in peace. And it was on that day, and Isaac's servants came and told him of the fortunes of the well that they dug. And they told him "We found water." And he called it Shiv'ah (Seven/Oath). For this the name of the city is Beer-Sheva (Well-Oath/Well Seven) to this day.
A separate earlier etymology is given for the same name Genesis 21:30:
And said "Because these seven ewes you will take away from me: in return you will be my witness, that I did dig this well (Be-er). And because of this the place is called Be-er Sheva' (Beersheba) because there the two of them did swear an oath (Shvu'a).
This story regards Abraham and Avimelech.
So which etymology is accurate?