Jo is a distinctive girls' name in United States, ranking #4329 in 2002 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 2002, approximately 1 in every 61,959 girls born was named Jo. FALLING Recent data shows the name is currently falling.