Sorry for the vague thread title.
What I’m asking is this: I’ve heard of putting “English” (spin) on a rolled bowling ball, and I’ve heard of someone getting their “Irish” (temper) up. Are there other examples of Nationalities used as nouns?
I just formatted a marketing document our law firm is preparting for some middle eastern client. At one point they used the word “Quatarization” to describe some approach to private equity deveopment in that country.
Pretty much any ethnic food is, at least colloquially, referred to by a nationality as a noun. Chinese, Thai, etc.
If one is in a difficult situation you can describe it as being in Dutch.
Scotch is of course an alcoholic beverage.
China is a ceramic material we make plates out of
(Turkey is something we eat, but I don’t believe it has anything to do with Turkey.)
(Polish is something to shine with, but again that’s I believe a coincidence.)
Never french a zombie! 
I spread an afghan over my ottoman every time I set a piece of china on it.
I’ve been known to Welsh on a bet.
I’ve been known to put a Chilé in my chili.
Danish (a type of pastry).
Japan (a type of black varnish)
I’ve only heard this one with reference to billiards and pool and it’s always confused me. Anyone know the etymology on this term?
All I do know is that we don’t use this term in England.
It’s all Greek to me.
Never french a zombie!
I’ve been known to Welsh on a bet.
Those are both being used as verbs
Actually, it may have:
Neither the usage or the hat style is as common anymore, but sometimes people simply wore a “Panama”. Never mind that “Panama hats” are actually from Ecuador.
Are you sure you don’t mean Qatarization (similar to Omanization etc) which means to get more locals into the work force instead of relying too heavily on imported labor?
That’s the first thing I thought of, but I’m not sure whether it counts. I am not a grammarian, but I don’t know whether, for example, “Chinese” as in “Let’s get some Chinese for supper” counts as a noun, or as an adjective modifying the understood noun “food.”
In some parts of the English-speaking world, a swede is a kind of root vegetable. (You may know it as a rutabaga.) Would that count?
A lot of people wear clothing made of suede. And pay for it with guineas.