Fair enough. The reason I figured it was done as such was basically because of two things:

1. The French name, which I've always found kind of pretentious.
2. "Lost Melody," the primary song they use when Belle Ame is on stage, is very much inspired by L'Arc, as far as I can tell. (Granted, all I have to work off of are OPs and EDs, and I've not purchased or downloaded a L'Arc song/album for, like, a lifetime ago.) Other incidental music they use at Greatful Sound also have that feel to it.