Which place was named for Laban's words, "May the LORD keep watch between you and me"?

Answer: Mizpah

The place was also called Mizpah, because Laban said, "May the LORD keep watch between you and me when we are absent from each other."

“It was also called Mizpah, because Laban said, “May the LORD keep watch between you and me when we are absent from each other.”— Genesis 31:49 (BSB)