Jo is a distinctive girls' name in United States, ranking #7556 in 2008 with 17 recorded births. The name reached its all-time peak in 1997 with 58 births ranking #2317. Since 1996, the popularity has decreased by 61.4%. In 2008, approximately 1 in every 111,219 girls born was named Jo. FALLING Recent data shows the name is currently falling.