Jo is a distinctive girls' name in United States, ranking #2630 in 1998 with 52 recorded births. The name reached its all-time peak in 1997 with 58 births ranking #2317. Since 1996, the popularity has increased by 18.2%. In 1998, approximately 1 in every 33,979 girls born was named Jo. FALLING Recent data shows the name is currently falling.