Jo is a distinctive girls' name in United States, ranking #2317 in 1997 with 58 recorded births. The name reached its all-time peak in 1997 with 58 births ranking #2317. Since 1996, the popularity has increased by 31.8%. In 1997, approximately 1 in every 30,011 girls born was named Jo. FALLING Recent data shows the name is currently falling.