Dr. Eggman and Dr. Robotnik are the same person, Eggman is his nickname. Gerald Robotnik is Ivo Robotnik's grandfather.
Ivo's full name: Dr. Ivo "Eggman" Robotnik
Gerald's full name: Dr. Gerald Robotnik
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Gerald Robotnik, Ivo (Eggman) Robotnik's grandfather, created Shadow.
eggman is a nickname regaurding his shape, a man that looks like an egg, robotnik is his true name but in sonic adventure 1 they started to call him eggman,nowadays robotnik is very rare, see they never did change it.
Dr. Ivo "Eggman" Robotnik's birthday is the same as Sonic's; June 23rd.
doctor eggman/doctor robotnik is fifty-seven. But in the show sonic X doctor robotnik is doctor eggmans grandfather so that shouldve tipped you off that he's old.
The main villain is Dr. Robotnik/Dr. Eggman.