Jo is a distinctive girls' name in United States, ranking #4467 in 2003 with 29 recorded births. The name reached its all-time peak in 1997 with 58 births ranking #2317. Since 1996, the popularity has decreased by 34.1%. In 2003, approximately 1 in every 63,002 girls born was named Jo. FALLING Recent data shows the name is currently falling.