Jo is a distinctive girls' name in United States, ranking #4870 in 2000 with 24 recorded births. The name reached its all-time peak in 1997 with 58 births ranking #2317. Since 1996, the popularity has decreased by 45.5%. In 2000, approximately 1 in every 75,666 girls born was named Jo. FALLING Recent data shows the name is currently falling.