I doubt anyone who isn’t familiar with French would pronounce it that way on first glance, they’d be more likely to pronounce it [name]Emer[/name]-ince I imagine. 
[name]Even[/name] though I’ve taken French I still pronounce [name]Genevieve[/name] as [name]Jen[/name]-uh-veev instead of the French Zhan-vee-ev, so a simple correction is probably all it would take.
Although if the future hubby is iffy on it, it would still make a great middle!