I imagine being sensible they'll just call them "centimes". And being French they'll push for everyone else to use the same word, and they'll probably succeed. It's a more comfortable word on the mouth anyway. "Cent" always sounds too abrupt.

Actually what they should do is give people the option of keep the national terms, when they change the money. So in England the Euro would be called the pound (or quid), and the cent would be a penny in France it'd be the franc and the centime, and so forth.

I can't see it'd be much more confusing - they could alsways call them New Pounds and New Francs. Or even Euro Pounds and Euro Francs, if it made peole happier.

I think that in England half the opposition would melt away overnight.

In fact there's no reason shouldn't just do it that way regardless. The same way for a century or so people in England used to call shillings "bobs", and five bob was "a dollar" - and the "quid" has never been an official term for the pound anyway; and the Sapnish talked about "duros" even though officially there wasn't such an denomination.