That is oddly fascinating. 
Do you know whether it is her birth name or a chosen name?
In any case, I struggle to see Hello as a name personally, perhaps because It feels more “random” than most word names? i.e., it does not fit into established categories like “nature” or “virtue” names, and admittedly does not conjure a vivid mental image for me. Incidentally, I happen to be quite fond of Sanrio characters and immediately thought of Hello [name_f]Kitty[/name_f], haha. 
[name_f]Mary[/name_f] Hello sounds like a cute stage or screen name, in my opinion!