Ah… Now I think I see more clearly what you’re looking for.
I thought “Okay, Oklahoma” as a town name qualified because it seems to be a pun based on the word “okay” as in “OK” in the sense of acknowledgement or affirmation, coupled with a possibly charming phonetic alliteration when used as a postal address, “OK” being the official two letter postal abbreviation for the state of Oklahoma.
“OK” is frequently spelled “okay”.
The town of Okay had several names before being officially named “Okay” in 1919 in honor of the O. K. 3-Ton Truck and Trailer manufactured there by the Oklahoma Auto Manufacturing Company.
“OKLAHOMA IS OK” appears on Oklahoma license plates (starting in 1967) and is a state slogan (slogans are often designed to foster tourism and good will) for the US state of Oklahoma.
“OK” is the official two letter postal abbreviation for the state of Oklahoma since 1963.
As wordplay, it’s probably only mildly interesting to Okies and humorous only to native Okayians at the expense of the victims of the wordplay.
I missed the point because “okay” is not a word peculiar to that region.
There are many places in the US with Native American names, such as “Narragansett Bay”, and “Iroquois County, Illinois"--"Iroquois" being the name of both the Iroquois People and the Iroquois language, and likewise with “Narragansett”.
There are also many places with names derived from Native American words, such as Punxsutawney, Pennsylvania:
...the name “Punxsutawney” derives from a Native American term which translates to “town of the sandflies” (or, perhaps, “town of the mosquitoes")… --wikipedia
Or am I still missing the point?