Why are some devs so uninventive and not checking things when it comes to names? There was already a roguelike named Valhalla, http://en.wikipedia.org/wiki/Ragnarok_%28video_game%29
Yes, I was excited when I saw this topic because I thought someone was actually updating Valhalla. But no. Different Valhalla.
This is why generic titles are a bad idea. It's not that hard to choose a title that's unlikely to be shared by another game, or at least another roguelike!