[Facts] Re: English Pronunciations of Oriane & Orianne
These are not common names and I've never met any, so I will tell you what I would assume by looking at them.
Orianne = I would feel confident in guessing "or-ee-ANN." Names ending with "-anne" generally have the stress on the last syllable, e.g. Joanne, Leanne, Marianne.
Oriane = I would feel unsure. "-ane" is not a common suffix for English names. My first try would be "or-ee-ONN," speculating that the name was spelled this way because it did NOT end with the typical "Ann" sound. But I would not be astounded if it was OR-ee-ann, OR-ee-onn, or even or-ee-ANN or or-ee-ONNA.