Suwaiba (also written with a Th as in Thuwaibah) is an indirect Quranic name for girls that means reward for good deeds, something that God gives you in reward for a good thing you do. It is derived from the TH-W-B root which is used in many places in the Quran.
Suwaida is an indirect Quranic name for girls. It is a synonym of Sawdah, which means area of land with many palm trees. It is derived from the S-W-D root (blackness, large number of palm trees) which is used in a number of places in the Quran.