Hexadecimal: Base-16 arithmetic. The sound-alike association with witchcraft is a bonus.
Molniya: A type of orbit geometry used by some Russian communications satellites. In Russian the word "molniya" means "lightning", which is appropriate give the very high velocity of a satellite in a Molniya orbit. However, the word is also used colloquially to mean "news flash". So it's doubly appropriate.
Wolfram: A good solid Teutonic word. Which is appropriate, since it's the German word for the very dense metallic element tungsten.