Jo is a distinctive boys' name in United States, ranking #5892 in 2002 with 12 recorded births. This places Jo in the top 47% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2000 with 14 births ranking #5166. Since 1996, the popularity has increased by 50.0%. In 2002, approximately 1 in every 161,789 boys born was named Jo. FALLING Recent data shows the name is currently falling.