I've recently come across a post (in English) speaking of Noether's theorem, where Noether's surname was consistently spelled as Nöther. But nowhere had I seen such a spelling of this name until this post. Even in her own work she wrote her surname as Noether, despite Göttingen being written with an umlaut in the same sentence.
So I wonder, is it correct (in German) to write such names with an umlaut instead of the original oe/ue/ae, or is it hypercorrection?