>The Boston version is Wuh-sta, which is probably different from how the Brits would have it.

Wusta sounds close enough to Wuh-sta to me, unless I'm missing something.

The big difference with a lot of those kind of names comes in the associated counties.

In the US I tend to hear Devon-shire with the shire emphasised.

For most people, all the shires in the UK are swallowed, so you get:
Worcestershire - wustersh-r
Lancashire- lancash-r
Devonshire- devonsh-r
with the accent of the first syllable, not the last. I'm sure that Shanks will know that proper phonetic spelling.

Only in the South West would you get the full devon-shire with a full shire but still having the accent on the "de".

I suppose it is because most counties were shires and it wasthe bit at the beginning that made them destintive, rather than the shire at the end.