Yeah, the "could" sound is the closest to the Norwegian pronunciation.
Sunniva used to be my very favourite name, but it died down when I got confused about the proper intonation and eventually realised it's not stressed the way I would like (I think - I'm still not quite sure ... I know the Norwegian way, but I'm not sure how it would translate into Swedish) My favourite combo for it was
Sunniva Lilja Natalia.