Sif is the Norse goddess of fertility, the harvest, and family — the wife of Thor. Her golden hair was said to represent the wheat fields; when Loki cut it off, the dwarves crafted her replacement strands of pure gold.
Sif is rare as a given name but rising — propelled in part by the Marvel character Sif (played by Jaimie Alexander in the Thor films).
Sif reduces to nine — the number of golden harvest.