Coby is a distinctive girls' name in England & Wales, ranking #2683 in 1996 with 5 recorded births. This places Coby in the bottom 46% of ranked UK girls' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 1996 with 5 births ranking #2683. In 1996, approximately 1 in every 59,200 girls born was named Coby. STABLE Recent data shows the name is currently stable.
Coby is a compact English short form of Jacob. That gives it a much clearer source line than the earlier broad discussion of several overlapping variant families.
As a nickname-style form, Coby works because it sounds casual and familiar while still resting on a major biblical classic. Its modern use is more flexible, but the Jacob connection is the clearest core route.