I kept googling Fjor and couldn't understand why nothing came up. I then tried Fjör and found this Old Norse fjör (“life; vigour, spirit, energy”). My guess is that the original spelling is Fjör and not Fjor. Leif means descendent or heir so the meaning would be something like heir of life/vigour etc Old Norse names were often combined into a "new" name like Tyrgrim, Grimulf, Torleif etc (using Tyr, Grim, Ulf, Tor and Leif) I also googled Fjörleif and it seems to be an Icelandic name. And it's listed several times as a feminine name which was a surprise to me.
* Ellen * Astrid * Eira * August * Emmanuel * Isidore Hey you! Out there in the cold, getting lonely, getting old, can you hear me?