Jo is a distinctive girls' name in United States, ranking #8393 in 2011 with 14 recorded births. The name reached its all-time peak in 1997 with 58 births ranking #2317. Since 1996, the popularity has decreased by 68.2%. In 2011, approximately 1 in every 125,629 girls born was named Jo. FALLING Recent data shows the name is currently falling.