Why there is an E after the U in Robt Muellers name

[jimmy the one]

7. Thanks for the in depth insight

Thank you for the in depth insight, truly. I only wish I understood half of it!
I think in a previous occupation, you a linguist yes?
I had two years high school German and two years in college - two semesters I think. All we were taught was the rounded lips method for the umlaut. I think this is not the rounded you refer to, is it?
Do you agree with my pronunciation guide for a o u au?
As far as what we know, there are far more things in the world which we do not know, as opposed to what we do know. And that pertains to all the eight billion people in here. We only excel in what we study or learn from experience.
Latin I can pronounce well, tho I understand little of what I am saying. Erk. The mispronunciation of many Latin words and terms is annoying, such as Pontius Pilate, which was in his time, phonetically, Pone tee oose Pee lah tay...... E pluribus unum is >> aye 'ploo ree boose oo num.

So simply put, what is fronting and rounding. These will be new experiences.