hmm...the only one I'm aware of was Zipporah, but others evidently speculate about the one in Numbers 12. I found this info in Fausset's Bible Dictionary:
The Cushite wife mentioned in Numbers 12 as the object of Miriam's jealousy can hardly have been Zipporah who was then long before married to Moses, but probably a second wife taken after Zipporah's death. Josephus (Ant. 2:10, Section 2.) makes him marry at Meroe one Ethiopian princess.
and it continues...
Zipporah's marriage must have been between the first and the second years. Habakkuk (Hab_3:7) connects Midian and Cushan, so that some think Zipporah is meant by the Cushite wife; but probabilities are on the other side. Only Canaanite wives were forbidden (Exo_34:11-16). Moses' marriage to a Midianitess and a Cushite successively typifies the extension of God's covenant to the Gentiles
And from the International Standard Bible Encyclopedia:
Whether or not Zipporah was the “Cushite woman” (Num_12:1) is a much-mooted question. There is little ground for anything more than speculation on the subject.