Totally unpronounceable in England? How does it sound to English ears? I'm only familiar with hearing Greek speakers say it.
It is spelled Nausika but said as in the subject,
like Nav-si-KA.
It was the name of a girl from Greek mythology who loved the sea (appropriate as DH grew up next to the sea, and the rest of his family still live there)
Actually, I love it, but is the worth the constant 'Navsi what?!' for poor DC who will grow up in England.
Views on this welcomed!
Other likely option is Anastasia.