This is a pun. "Geek" sounds like "greek", and greek mythology is known to have many gods for different things. Like a Greek god, Qwertyus is the god of something very particular, in this case keyboards. A lot of geeks like computers, and Qwertyus is based on QWERTY, which refers to the Q, W, E, R, T, and Y keys on a computer keyboard.
Qwertyus , god of keyboards , is a character from geek mythology .