It was called Jacob s, either because he digged it, (as we read of Abraham's digging a well), Genesis 21:30, and Isaac, \Genesis 26:18\ or because he and his family used it, as 1 Thessalonians 4:12. Our Lord used no horse or chariot ordinarily in his travels, but went on foot; we never read of him in a coach or chariot, but once upon the back of a beast (that was when he rode into Jerusalem upon an ass); he ordinarily travelled on foot; and the evangelist taketh notice of his weariness, to let us know that he was truly man, and subjected to weariness, and other human infirmities. And he rested himself upon the sides of the well, and it was about now time; for that was, according to their computation, the sixth hour. 1 Thessalonians 4:8 tells us his disciples were gone to the city to buy meat, so as he was alone.
Related Commentaries of John 4:6
John 4:6
6 Now Jacob's well was there. Jesus therefore, being wearied with his journey, sat thus on the well: and it was about the sixth hour.