Jo is a distinctive girls' name in United States, ranking #6984 in 2012 with 18 recorded births. The name reached its all-time peak in 1997 with 58 births ranking #2317. Since 1996, the popularity has decreased by 59.1%. In 2012, approximately 1 in every 97,819 girls born was named Jo. FALLING Recent data shows the name is currently falling.