Jo is a distinctive girls' name in United States, ranking #5452 in 2006 with 25 recorded births. The name reached its all-time peak in 1997 with 58 births ranking #2317. Since 1996, the popularity has decreased by 43.2%. In 2006, approximately 1 in every 76,043 girls born was named Jo. FALLING Recent data shows the name is currently falling.