I recently got a knife with a handle made of a beautiful resin blue like the starry blue sky, and the blade dark as night.
As there is already mormacil for black sword, I thought of naming it Morialcar (mor = black, darkness and alcar splendour) something like Black Splendor (the Splendor of the first dawn and Black of the blade's darkness).
I'm not sure if Mor (black, darkness) can be used with Alcar because it's a splendor/radiance of light and they're totally opposites (although the idea is pretty cool lol).