Sonja is a distinctive girls' name in United States, ranking #1712 in 2001 with 106 recorded births. The name reached its all-time peak in 1998 with 159 births ranking #1179. Since 1996, the popularity has decreased by 24.8%. In 2001, approximately 1 in every 16,986 girls born was named Sonja. FALLING Recent data shows the name is currently falling.