Brits say "dar-bee" for both the town and the race, but Americans pronounce it as it's spelled.
Did Brits used to say "der-bee" too and that's why it's spelled that way but they changed over time?
Was it always pronounced like in the UK but American pronunciation followed the spelling for some odd reason?
Is it borrowed from some other language so there's a disconnect between the spelling and the UK pronunciation?
Best Answer
This website says
So a more general sound change that took "er" to "ar" was present in some lower-class British accents when Henry Fielding wrote Tom Jones (ca. 1750). This 1849 dictionary found in Google books indicates that this pronunciation had for the most part vanished a hundred years later1. The pronunciation now persists in only a handful of words:
I take the liberty of including varsity here because it was originally short for university. However, university has reverted to the standard pronunciation, while varsity has switched to the phonetic spelling.
1 Interestingly, the dictionary also says that many Americans pronounced sergeant with "er".