Sonja is a distinctive girls' name in United States, ranking #1179 in 1998 with 159 recorded births. The name reached its all-time peak in 1998 with 159 births ranking #1179. Since 1996, the popularity has increased by 12.8%. In 1998, approximately 1 in every 11,113 girls born was named Sonja. FALLING Recent data shows the name is currently falling.