EMACS started as Eugene Ciccareli’ init file for the TECO editor (which was also a programming language) around 1976. Hence the name (Eugene‘s Macros). It was later rewritten in Lisp for Multics, the MIT Lisp Machine (I worked on one for the Xerox lisp machine as well), and later Unix (in those cases using lisp only as an extension language)
Interesting, do you have a source for this? I’ve always read that it stood for Editor MACros, are you saying this is a backronym?
For a start it's either spelled "Emacs" or "EMACS", and definitely not "eMacs".
Then it's closer to an OS than an editor.
Everyone knows that, but iOS autocorrects Emacs -> eMacs because Apple used to sell a product called "eMac".