Sorry 12TRIBE my brother but natty is quite right.
The tribes are set in the order of the months, but the Jewish calendar begins with April, not January (this is where the confusion is coming from) meaning that Gad is November (Elul.) If you want further clarification, just look up Prophet Gad Carrington's Earthday: 1st November, same as mine and I be a Red Tented Gadman!
As for baby names, that's a tough One, and I'm not so good on meanings. However, if you want some solid African characters from the Bible, how about Enoch? Isaac? David? Or my personal favourite Elijah, to keep "JAH" at the forefront of his character! As for girls, not too sure on African girls names, Biblically; Ruth is sound.