Jonai is a distinctive girls' name in United States, ranking #6188 in 1998 with 16 recorded births. The name reached its all-time peak in 1998 with 16 births ranking #6188. Since 1996, the popularity has increased by 128.6%. In 1998, approximately 1 in every 110,431 girls born was named Jonai. FALLING Recent data shows the name is currently falling.