For French, the last accent in a given word determines the order.[14] For example, in French, the following four words would be sorted this way: cote < côte < coté < côté. The letter e is ordered as e é è ê ë (œ considered as oe), same thing for o as ô ö.
Many examples are listed on Wikipedia: https://en.m.wikipedia.org/wiki/Alphabetical_order#Language-specific_conventions