It's from the mathematical functions "Tan", "Sin" (sine) and "Darcos" (double precision arccos). The middle name was A long before I had a word. I settled on "Arogan" which is shiort for "arrogant."

It was intended to poke fun at the prediction in the last book of the Bible, revelations, how the "number of the beast," i.e. the Antichrist, would have a three-word name with six letters each.