TATTOOED MAN

Somewhat ridiculously, the "Tattooed Man" was never referred to by any name whatsoever in his story arc. He was variably called boss, monster, old man, or "the Devil himself", but no actual name. Even the recap pages provided nothing. In Uncanny X-Men (1st series) #524, Danger's X-Brig system referred to him as "Doe, J. - Tattooed Man", but even that may have been just for reference's sake.