Sonja is a distinctive girls' name in United States, ranking #1969 in 2007 with 105 recorded births. The name reached its all-time peak in 1998 with 159 births ranking #1179. Since 1996, the popularity has decreased by 25.5%. In 2007, approximately 1 in every 18,309 girls born was named Sonja. FALLING Recent data shows the name is currently falling.