Mu-Sa means 'white sarah' or he is from the house 'sarah' inheritance. Remember the language back then wasn't complicated like now and was in early development, what is complicating is the babylonian book not the original torah if you read the hebrew against oral language. Isa means 'isaac-sarah' convent so he will complete 'mu-sa' convenant which is only 'sarah' and isa will do 'isaac convenant'. That is house of israel though not our 'house' as we live in different convenant. So moses was white, but isa is unknown as he will come from sarah n isaac line that's all his name signifies and not the color. Even 'sarah' means 'rah' something which means 'good' in ancient egypt not 'god'