Jo is a distinctive girls' name in United States, ranking #6841 in 2014 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 2014, approximately 1 in every 99,219 girls born was named Jo. FALLING Recent data shows the name is currently falling.