Featherstonehaugh: See Wodehouse's character Ukridge -
https://en.wikipedia.org/wiki/Stanley_Featherstonehaugh_Ukri...
There's also https://www.cntraveler.com/story/youre-probably-pronouncing-...
"...You could try hundreds of pronunciations of "Cholmondeley" (in Cheshire) before hitting on "chumley," and the sixteen-letter "Featherstonhaugh" (in Northumberland) drops more than half its weight to become "fanshaw."..."
etc.