Modern German borrowing of the Irish name Fionn, spelled to reflect the Irish pronunciation. Fionn goes back to Old Irish finn meaning "fair, white, bright", best known from the legendary hero Fionn mac Cumhaill. It is not a Norse or Norwegian name.
Vibe
gentle
How it ages.
Deeply Nordic; the Fj- opening immediately signals Scandinavian origin and makes it memorably distinctive.
The cultural moment.
Rare in Norway; a creative spelling variant chosen by parents seeking maximum Nordic character.