The meaning of “בֵּית רְחוֹב”

“And there was no deliverer, because it was far from Zidon, and they had no business with any man; and it was in the valley that lieth by Beth–rehob. And they built a city, and dwelt therein.”

“And when the children of Ammon saw that they stank before David, the children of Ammon sent and hired the Syrians of Beth–rehob, and the Syrians of Zoba, twenty thousand footmen, and of king Maacah a thousand men, and of Ish–tob twelve thousand men.”