Jay:

Bottom line on your query: I couldn’t care less how you pronounce it, and in fact I think it’s a bit precious to fuss about how people pronounce your name. At any rate, I find it irritating when other people make it an issue with their names. Call me Derb, call me Darb, just so long as you call me. Attention whore? You bet.

That’s the social aspect. Wikipedia, though, claims status as an encyclopedia. If an encyclopedia decides to give its readers information on pronunciation of proper names, the information should be correct. It should give the native pronunciation together with any significant variants or foreign adaptations an inquirer is likely to encounter: both “mask-VAH” and “MOS-coh” for the capital of Russia.

The native (later 20th-century educated southern British English) pronunciation of “Derbyshire” is / ˈdɑːbɪʃə / (DAH-bi-shuh). Contra Wikipedia, there are no r sounds included, in line with the observations of Prof. Daniel Jones in §746 of his classic Outline of English Phonetics: “[I]n London English the r is never sounded when final or followed by a consonant.”

The only significant foreign adaptation is the reading of the name by educated Americans, most commonly / ˈdɜɾbɨˈʃaɪəɾ / (DER-be-SHY-er). I don’t object to this any more than a Russian should object to “MOS-coh.” I use it myself in fact, when giving my name over the phone to some overworked minimum-wage drudge trying to write it down. Lessons in applied phonetics would, I feel sure, fall on stony ground there.

Wikipedia is telling me I don’t know how to pronounce my own name. I say Feugh! to Wikipedia.