You'll have to give me a source cause frankly I'm not seeing it on google. The only thing I can find is a South African name meaning "descendent of a king". While a legit cool name that's still a dude's name and last I checked she's not African and this is a Manga from Japan. Meaning the letter L and the entire sound of it just doesn't exist in their language so all Ls become and sound like Rs. Meaning any Japanese "Reon" is already inherently a mistranslation of Leon in the first place.