I like the name Xako which comes from a forgotten character out of the Golden Age of comics. No pronunciation is mentioned.
Xako was described as a demonic intelligence trapped in the body of a giant spider (though it had only four insect-like limbs). He fancied himself the puppet master of the universe and his intention was to destroy all life on earth, so it could be inhabited by his race from the spider star region of space. He appeared to be lost in space after being struck by a comet while trying to destroy the spacecraft of Rick Evans. Evans had believed that Xako was only a myth, before the creature nearly destroyed all life on Earth.
Xako was about the size of a large elephant and could spin massive webs, capable of catching a rocketship. He was also capable of controlling matter through some unknown means and surviving in space, unaided.
or Teneshad
Teneshad was a demon originating from a hidden realm called the Half World. The ancient, hand-written book used for summoning him was kept - or possibly inherited - by a man named Mr. Sylvestre who used his wish-granting abilities to gain fame and fortune. The wealthy manor house which he formally resided was also built by the demon...
Admiring the demon’s handiness, Danny commanded Teneshad to provide him and Helen with food and comfort, despite Helen’s protests. But with every wish, Teneshad grew larger and more imposing. In addition, hoards of vermin-like creatures - whom Teneshad referred to as his “pets” - were gathering in droves throughout the household. Eventually, Helen persuaded her husband to leave, but the creatures prevented their escape. Having enough, Helen threw several golden trinkets out a window which caught the attention of the city police below.
Here are some other names out of the Public Domain Superhero Wiki: Freddy Demon, Baalzebitch, Behemother, Krampus, Rag-time Goblin Man, Green Devil, and the Horrible Hand.