Board Thread:Archie Sonic/@comment-3121860-20170115085645/@comment-4220590-20170116215443

Hulk10 wrote: How come Eggman's last name was Robutnik in the original comics but now he is just called Eggman? In the pre-super genesis wave, after Robo-Robotnik mk. II took over and became the modern robotnik, the population gave him the nickname "Dr. Eggman" after his new egg-shaped body. While he hated that nickname, Robotnik embraced it in an effort of self-empowerment, and renamed his empire the "Eggman Empire"

In the post-sgw, I suppose it was a nickname robotnik always had (maybe it was given by Sonic?)