The worst for me in IL is Des Plaines.
@mathmom I do needlework and come across the word “ombre” all the time – luckily in print, because I don’t want to figure out how to pronounce it!
I guess it depends on one’s definition of “common.” “Ombre” is used often in fashion. Additionally your hair stylist is likely to be quite familiar with the term. It’s certainly a word one would come across more often than “balayage,” 
Seems like the most common pronunciation for that city is el ei (as in L. A.).
“Q-pon is correct”
Nope. 
And it’s fin-ance not fine-ance.
Why do so many Americans pronounce Porsche wrong, including many who own one? https://www.youtube.com/watch?time_continue=13&v=Im2eYuGdmfY
I have pronounced pillow wrong since I was a child and now it has stuck. For some reason, I say pell-ow.
I royned lots of things as a kid, but now I just ruin them. “Now, don’t go and royn it!” Is it Southern?
My husband is from a different part of the country than I am so we’ve noticed our different pronunciations and words. Our most recent discussion was over how to say umbrella. He says UM-brella I say umBRELLa. I say grocery cart, he says buggy. Last night when I was feeling punky I had to point out how annoying he says sandwich. LOL
Rhianna wants to weigh in.
https://www.youtube.com/watch?v=CvBfHwUxHIk
And now that song is stuck in my head.
I say CEE-ment instead of ceMENT. Can’t quite shake the twang of my youth. Other words I have to slow down to pronounce “correctly”: PEEcans, CAR-mul for caramel.
If I’ve been drinking even a little, all bets are off, ya hear?
@doschicos I was just going to say that. The correct pronunciation is umbrella, ella, ella, eh, eh, eh 
Born and bread in the midwest as was my friend. This story she tells fits right in here.
She moved to Texas and sat in on a pre-K class where the teacher gave a little lesson explaining that learning to read is hard work because sometimes words sound the same but are spelled differently. Her example - pen and pin.
In the Midwest - pen and pin are NOT pronounced the same.
@mathmom, I’m with you on the French pronunciations. I don’t think it’s pretentious. It’s just hard to un-know something, especially if you learned the word for the first time in France.
@mathmom, the walls thing is my biggest thing! There is a national commercial running now with a well known celebrity who says walls in the commercial. I will never use their services for just that reason.
Regarding names in other languages, some places seem to have had a hard time finding names for streets…
For example, consider the two streets on opposite sides of the creek:
https://www.google.com/maps/place/Ruisseau+Francais+Ave,+Half+Moon+Bay,+CA+94019/@37.4845098,-122.4441374,17z/
Or the two streets that start parallel and then merge into one:
https://www.google.com/maps/place/Lago+Ln,+Santa+Cruz,+CA+95062/@36.9676941,-122.0013409,18.5z/
Growing up with european parents i still say words like valise and attaché case.
The variations of Atlanta roads with Peachtree in the name must really set you off.
My father says me-ilk for Milk, but he can’t hear the difference when he says it. I’ve tried to teach him. It usually goes something like this:
Me: Say mill
Him: mill
Me: Now just add a K at the end of mill.
Him me-ilk
Me: Lets try again. Say mill
Him: mill
Me: Now say ilk - like ill with a k at the end.
Him: ilk
Me: Pefect. OK, just put those two together and say milk
Him: me-ilk
Me: eye roll
Him: WHAT?!
(We both laugh.)
He also says “krick” for creek, which might be regional, but he’s of 9 and his siblings don’t say krick, so no idea where that came from, nor does he.
I can’t bring myself to say “foy-yur” (for foyer). It sounds ridiculous to me (much like “Jeye-roh” for gyro sounds ridiculous to me, but some people have mentioned it sounds pretentious if I use what they consider the French-only pronunciation, so I just avoid the word altogether and use entry or entry hall.
Also, I hear a lot of people say INsurance, where inSURance sounds correct to me.
Do y’all call it a bedroom suit or a suite? When I was old enough to read printed furniture ads, I thought they’d misspelled it.
Suite. A suit is what a man wears on date night ; )
I don’t have the accent but my hometown is known for saying water as wooder and creek as crick.