I like
Kerensa a lot. For some reason I think it's go nicely with a sister
Zuleika / Suleika.
nns:
well in Dutch I'd say Renske, but that's not an option right ;)
Rensa
Kera
Kersa
Kers (means
Cherry in Dutch :P)
Kerri /
KeriKensa
but I wouldn't use a nn and just call her
Kerensa...