Adam Clarke on Genesis 30:11

She called his name Gad - This has been variously translated. גד gad, may signify a troop, an army, a soldier, a false god, supposed to be the same as Jupiter or Mars; for as Laban appears to have been, if not an idolater, yet a dealer in a sort of judicial astrology, (see Gen 31:19), Leah, in saying בגד bagad, which we translate a troop cometh, might mean, By or with the assistance of Gad - a particular planet or star, Jupiter possibly, I have gotten this son; therefore she called him after the name of that planet or star from which she supposed the succor came. See note on Gen 31:19. The Septuagint translate it εν τυχη, with good fortune; the Vulgate, feliciter, happily; but in all this diversity our own translation may appear as probable as any, if not the genuine one, בא גד ba gad, for the keri, or marginal reading, has it in two words, a troop cometh; whereas the textual reading has it only in one, בגד bagad, with a troop. In the Bible published by Becke, 1549, the word is translated as an exclamation, Good luck!