I love [name]Oona[/name] so so much! Personally, I think [name]Oona[/name] [name]Persephone[/name] sounds brilliant!
names I think go with [name]Oona[/name] (sorry for any repeats):
[name]Maeve[/name]
[name]Blythe[/name]
[name]Edith[/name]
[name]Charis[/name]
[name]Sylvie[/name]
[name]Sabine[/name]
[name]Nancy[/name]
[name]Simone[/name]
[name]Garnet[/name]
[name]Delphi[/name]
[name]Tess[/name]/ [name]Tessa[/name]
[name]Margot[/name]
[name]Elsa[/name]
[name]Iris[/name]
[name]Flora[/name]
[name]Seren[/name]
[name]Greer[/name]
[name]Sloane[/name]
[name]Phoebe[/name]
[name]Martha[/name]
[name]Cleo[/name]
[name]Bridget[/name]
good luck 
p.s I also adore [name]Lucy[/name] and [name]Alice[/name] together!