My name just came once, no idea how. I have been using it for a few years, so if you see a Shantu somewhere, it may be me..
By the way, if you are interested: as I read, Shantu is one of the 13 Rasas in Hinduism, it means absolute quietude. Or something like that.. Did not know it when I chose this name.
I like this name because it has a bit of tribal or indian feeling and it sounds cool..