I knew this was a male name and a variant of Moses (Musa from Winx Club not withstanding), but in researching into Soviet Russian ballet in the 1950s I found a Russian (? She was dancing in Russia) ballerina by the name of Musa Gottlieb. I also saw it spelled Muza. She is pretty much nonexistent on the Internet, the only thing that can be found is that she was in the film ‘Stars of the Russian Ballet', but she was dancing opposite a famous dancer so I would assume she had some kind of career, and yet there is nothing, at least on the English internet. Hm...