Sonja is a distinctive girls' name in United States, ranking #1686 in 2003 with 114 recorded births. The name reached its all-time peak in 1998 with 159 births ranking #1179. Since 1996, the popularity has decreased by 19.1%. In 2003, approximately 1 in every 16,027 girls born was named Sonja. FALLING Recent data shows the name is currently falling.