There was a time, before the age of the computer, when typographical systems had work-arounds where diacritical marks were not usually available. Ä, ä, Ö, ö, Ü, ü and ß were rendered, respectively, as Ae, ae, Oe, oe, Ue, ue and ss. I have never seen the name Goebbels rendered in any format other than as Goebbels, even in texts positively swarming with umlauts. Is it my imagination, or is there some reason that I have never seen the name as Göbbels?