Other oddities:
In the US, the name Maurice is pronounced in the most affected way possible, "Maw-REESE." Over there it's plain old, "Morris." Then the Brits have that silly name, "St. John," which they themselves corrupt into, "Sin-gin," though that kind of makes sense since gin does seem to help pave the way to sin.
Here in the New York we have a few weirdities. Houston Street in Manhattan is always pronounced, "How-ston." To say it wrong means you didn't even bother to look at a tourist guide. By the same token, people in the northeast with Houston as a surname also pronounce it How-ston. In the UK, it seems that name, as it is elsewhere in the US, is pronounced, "Hews-tin."
Between The Bronx (yes, there is a "the" in front of Bronx, just like, The Hague,) and Manhattan, there's a churning and difficult to navigate bit of river named Spuyten Duyvil. It's also the name of a small neighborhood of The Bronx. We pronounce it Spite in' Die-vul, which is actually not from from the original Dutch.
Just elsewhere near me, there's Wilkes-Barre, Pennsylvania and it's pronounced, "Willks Berry." Same goes for Barre, Vermont. Many people think, for some odd reason, that Port Jervis is pronounced Port Jarvis, but it isn't. It's pronounced just like it's spelled.
Poughkeepsie seems to throw people too. They try to be too delicate with, "poo keep sie," when it's merely, "Pa-kipsee."
People in Connecticut and NYC say "Grenitch" for Greenwich, but in upstate NY, the town by the same name is really, "Green-witch."
There are lots of Medinas all over the US. Some say "Meh deena", others say, "Muh dinuh."
Contrary to any possible sense, Versailles, Ohio is pronounced, "Ver-sayles." Be sure to do the same thing Vermilion where it's "vermillion."
I really fucked-up on one of my first visits to Ireland and passed a sign which read, "Ballymahon." As I was reading signs driving by, with my friend's wife driving no less, I said, "Bally Ma-hone." She laughed and immediately corrected me since my pronunciation was essentially, "Fuck the whore," in Irish.
Go to Moscow, Idaho and don't dare to say, "Moss cow." It's Mos coh."
In the largest of fuck-ups and it figures since they're near Arkansas, the people of Missouri want you to know that it's pronounced, "Mizurah." Similarly, Nevada is close-ended as well. It's, "nəˈvædə" not "Nev ā da," nor "Nuh vá da."
Going to Montana? Be sure you say "Helen-uh", not, "Hell ay nuh."
There are zillions of these things all over the world and nobody can be expected to know them all. I think if you make an effort to learn before you go, people appreciate it.