See posts by Jean-Luc Loubert. He's the authority. All Louberts are descendants of Pierre Loubère.
http://boards.tiscali.ancestry.co.uk/surnames.loubert/15/mb....I think we are about 500 Louberts in North-America, but if you want better information write to Jean-Luc, he's very nice and has published a wonderful book on our family history.