But God clave an hollow place that was in the jaw, and there came water thereout; and when he had drunk, his spirit came again, and he revived: wherefore he called the name thereof En-hakkore, which is in Lehi unto this day.

So God opened up the hollow place in Lehi, and water came out of it. When Samson drank, his strength returned, and he was revived. That is why he named it En-hakkore, and it remains in Lehi to this day.