Mysterious sounding boy names?

I am helping my friend with her game project and there is a character who hides his identity from others (basically there is a mixup in identity and he doesn't bother to fix it). Now, I have the name ready that others will call him, but I need his real name for later in the game.

I was hoping for something either mysterious sounding or something with a dark or sad meaning. The 'substitute' name he has during the game is something sweet, so I want something of the opposite to contrast it.

The game takes place in a medieval fantasy world, similar to the Fire Emblem series so no modern names please. thanks for the suggestions