Wooh! Massive list!
I like:
Arlo, Parker, Arthur (but the 'th' pn issue would put me off),
Ezra, Perin/Elvin (interesting ones, but the in pn in English would put me off)
Cosmo, Artie, Percy, Saffron (but surely that is for a girl?),
Aldo (not to be used in France when adults will remember Aldo Maccione),
Caspein (Casper/ar, Caspian are way better or Gaspard the French equivalent).
Thelonius: A bit big maybe? Quinn, Jethro (but the th thing again)
Alfred , Balthazar, Walter, Art, Cyrus.
Eliza (pn issue) , Greta, India (pn won't be the same, though), Ruby, Liberty, Athena (th again), Cora, Gwendolyn, Blossom, Luna (u versus oo issue), Saffron, Bluebell, Iris,
Violet (maybe Violette? note: a lot of French people don't like using that name because of Viol being the French equivalent for rape).
Elizabeth (Letty), Cherry (cute but too close to Cherie, Darling in French).
Delilah, Matilda, Willa, Edith but the TH thing again, Elsie, Olive.