Since we're talking town names, let me mention a village near me - Méasnes. I'm afraid I can't give you a definitive answer to the pronunciation of this one (spoiler or otherwise) because that's the very point. It depends on who you talk to as to how it's pronounced.
It is pronounced by non-local French speakers as [me.an] (aforementioned IPA) but as the village name derives from Occitan, it's pronounced by local locals more like 'mesnes'. A source of discussion/amusement whenever we (local cycling club) rode through there, but never with agreement reached.