Worcester, Massachusetts is also interesting, in a different way. The locals say it right, but anyone not familiar gets it wrong.

Or maybe UK folks get it right?

I live 25 mins away from Worcester UK. All U.K. born adults know to pronounce it “wuster”

Worcestershire sauce ("wiss-ta-shirr") is a thing in the US too, though not Worcester sauce.

Except it's still mostly pronounced WUSS-ter sauce in the UK.

Do you mean Warchestersauce? Sponsored by Blizzard?

No?

It’s pronounced wuss-tu-shu.

/wɪs.tə.ʃɚ/

That link indicates that the second syllable is rhotic, a position which I and you have both claimed is false.

Sounds and looks exactly the same to me!

That reminds me of Salinas \suhleenis\ Calif and Salina \suhlainuh\ Kansas.

Sequim, WA is an interesting one.

But back Spanish, the word Mexico itself I’ve heard as: \meiko\, \’mehiko\, \’meXiko\, \’meksiko\ and of course \’meksikou\

I believe that one had [ʃ] (English 'sh') when the Spanish got there but then there was a change in Spain (in Castilian only even, not in Catalan or Galician) from /ʃ/ and /ʒ/ -> /x/ (like the 'ch' in loch) and they brought it to the Americas.

Somehow those Spaniards brought that change to /x/ to all those Nahuatl place names but they never brought /θ/ to everyday speech in Mexico. I scratch my head at that.

The way Nat King Cole pronounces it in Route 66, of course.