Jo is a distinctive girls' name in United States, ranking #5043 in 2015 with 27 recorded births. The name reached its all-time peak in 1997 with 58 births ranking #2317. Since 1996, the popularity has decreased by 38.6%. In 2015, approximately 1 in every 66,098 girls born was named Jo. FALLING Recent data shows the name is currently falling.