Long Island Iced Tea
Idaho Potatoes
New York style cheesecake
Welsh Rabbit
Cheese Danish
English Muffin
Kentucky Fried Chicken (technically obsolete)
Manhattan (cocktail)
Blue Point Oysters (named after where they were originally harvested, though I believe the grounds are now depleted).
California roll (sushi)
Szechuan beef, chicken, etc. (a Chinese province).
Pad Thai
Yorkshire Pudding
Parker House Rolls
Toll House Cookies
Rocky Mountain Oysters
Sex on the Beach
NY Strip Steak
Georgia Peaches
Pennsylvania Dutch Bread
Coneys (After Coney Island)
Cornish Pasties
Philly cheesesteak
Coney dog
Manhattan (the cocktail)
Long Island Iced Tea (also)
RealityChuck, there is a Kentucky Fried Chicken – not KFC – in downtown Cleveland. I used to pass it every day before my parking lot was reassigned, but that was only about five weeks ago.
Eccles Cakes
Pontefract Cakes
Bath Buns
Manchester Tart
Bakewell Tart
Whitley Goose
Newcastle Brown Ale
Gosforth Gridies
Cognac
Singapore Sling
Cafe Zurich (cocktails)
and Wieners
Thousand Island Dressing
For that matter, Catalina dressing. And Ranch dressing (for Hidden Valley Ranch). And if you want to stretch matters, Italian, Russian, and French dressings, as well.
A gentleman named Oscar Tschirky was employed by hotelier George Boldt as the maitre d’ of the Waldorf-Astoria Hotel’s in-hotel dining facilities. Mr. Tschirky is responsible for both the following:
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He suggested mixing chopped apples and celery into mayonnaise and serving it over a bed of lettuce. Later chopped walnuts and, optionally, grapes or raisins were added to the mix. This was named after the hotel, the Waldorf Salad.
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Mr. Tschirky’s employer George Boldt loved the Thousand Islands resort area on the St. Lawrence River between northern New York and eastern Ontario. In honor of Mr. Boldt’s summer place, his idea for a creamy salad dressing, mayonnaise mixed with barbecue sauce and green pickle relish, was christened Thousand Islands Dressing.
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On Czech beer: Anyone remember the Sudetenland, the German border area whose cession in the Munich agreement was one of the lead-ins to World War II? The Sudetendeutsch had lived there, as a part of Bohemia, for hundreds of years, mostly under Austrian rule until 1918. Their beers were famous, particularly those from Budweis, today’s Ceske Budejovice, and Pilsen, today’s Plzen – Budweiser and Pilsener. Anheuser-Busch brewery of St. Louis brought out an American beer intended to be as close a copy as possible of the beer from Budweis, and hence named it Budweiser.
The area bordering the Maas River north of Liege, which ended up being divided between Belgium and the Netherlands, was famous for a very odoriferous soft cheese, named after the province: Limburg.
Cortland Apples (Cortland, NY)
Fig Newtons are named for the town of Newton, Massachusetts (and not Isaac Newton).
New England Boiled Dinner.
Peking Duck
Baked Alaska
In these parts, Hawaiian pizza means ham-and-pineapple
Humboldt Fog cheese.
Canadian Bacon!
I’d call “-ian” names stretching it a bit. My understanding of the OP is that it involves place names, not just vague references to nationality. That’s why I noted that “Italian, Russian and French dressing” were stretching it. The list could jump to 4 or 5 times the likely size if we include those kind of references.