Over the past 110 years, 35 065 girls have been named Sonja. The name Sonja ranks 651th in the United States among the most common names for girls. For the first time more than ten times newborns were named Sonja in 1921. The peak of popularity of the name Sonja came in the 1960s and 1970s. You can see absolute numbers and relative numbers on the chart. Indicators per 100K more accurately assess the popularity of the name.