Nouvelle Calédonie is a former French colony. It may be one of the explanations to this situation.
it's still a French territory actually
(for the statisticians, it's a part of the "French Republic" but not of the "Whole France" actually
As for the Canadians, they helped the French a lot in the two world wars
In the north of France, near Le Touquet, there's a very large Canadian cemetery for instance.
Other countries : don't worry too much about French tennis : in generations 91 to 94, France is quite weak actually
And Canada seems to have two young good players in generation 94 : Edward Nguyen and the other one is Peliwo (both finalist and semi-finalist in Orange Bowl, I think)