I see all kinds of very , very unique names on the www. Here are a few more. Which of the following sounds best:

Kaysannorra Ellieza
Riennonie Avalia
Amarosa Caliope
Davienne Sonora
Omanessa Ariaddny
Glauscesca Avalia (Glaow-ches-ka)
Sylvianna Estellia

Kaysannorra Ellieza ---> too many vowels and double letters
Riennonie Avalia --- same as above
Amarosa Caliope ---- not too bad, not my taste.
Davienne Sonora ---> my fave. I'd change the second name.
Omanessa Ariaddny ----> don't care for it.
Glauscesca Avalia (Glaow-ches-ka) --- no! bit close to 'glaucoma'.
Sylvianna Estellia ---> kinda nice, second name without "a" ending. Like Estelle.

Well those are unique for sure.

I agree with F.J.P.. I think Davienne is cute. I would even call her Davi.
If you shortened Kaysonnorra to Kaysonora it could work as a mn for Davienne.
Just my opinion.

How is Davienne pronounced?

i also like Omanessa the best