Niamh is sort of pronounced Neeve, but the 'vuh' sound is very soft.
There is a member with this name so she may see the post.

How about

Allira
Adara
Amalita
Adelita
Anais
Carys
Camille
Dior
Elodie
Freya
Julitha
Kali
Kalani
Lani
Lucette
Lucienne
Mina
Moia
Mara
Matisse
Nerissa
Rhiane
Rhiannon
Roshana
Saskia
Sari
Talullah
Trelise