Heck, one of the stories behind the name for Robin is that it's a nod to Robin Hood. Hood is out thanks to Jason, but he could take on the name or a reference to another famous vigilante. Or sleuth. Lock?
But it doesn't seem like it's graduating from the other name. And it doesn't really grab the attention. I like the name fine (probably only because I thought of it), but it'll get a collective "huh" from the public and the assumption would be that it has to do with keys, not Holmes.