"HAY-vrill " is just down the road from me.So there must be sub-regional-accent thingies. Then there is Tewksbury -- Tooks-bry and Billerica --- Bill-RICKA and the ever popular Worcester which all the Brits will be glad to help with.

I grew up in Boston, not far from these towns, and also near Medford - pronounced Meffuhd, even though Bedford was pronounced as you'd expect. I have to differ on the prononciation of Worcester. The Boston version is Wuh-sta, which is probably different from how the Brits would have it.