Sonja appeared on the top 1000 list from the 1930's until the 1980's. Its most popular year was the 1960's where it ranked 269.
― Anonymous User 9/25/2006
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Sonja is also a common Macedonian name. Letter N followed by J make up a letter NJ (as in NEw) in Slavic languages. It is pronounced the same as Sonia or Sonya, not Son-JA as in JAil.