Misson impossible: naming a 3rd child

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We need names for our 3rd child. It should be easy to pronounce and to spell in English, French and German, go with a French last name, not contain an R. Most of classic names are already "taken" (such as Christine/Christian, Marie, Elisabeth, Anne, Michael, Oliver, Alexander etc.), as we have a large family. So far, I am really short of ideas. So here is my present list (any suggestions are very welcome):
Boys:
Nicolas (would a French spelling seem strange in England)
Max (is it too popular?)
Leo or Leon (is it too popular?)
Girls:
Alice
Sophie (is it too popular?)
Nathalie

Blanche

Amelie? Thomas?

From Your list my favourites are Max and Nathalie, my nephew and my Sister's names :-)
I am half Swiss and DH is half Irish and we wanted names that would be 'European' crossovers. We have Joseph and Dominic and if DC3 is a Boy (6 days overdue already) will be Fabian (we were going to go for French spelling Fabien but thought it may cause confusion so going for the latin). For a Girl we are going for Eleanor.
Good luck with Your decision making - it is hard for number 3 for sure.

what are your other children called?
I like all your names.
Leo/ Leon not popular where I am.
Sophie is popular though.