Dorthy is a distinctive girls' name in United States, ranking #8737 in 2000 with 11 recorded births. This places Dorthy in the top 49% of ranked US girls' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 1998 with 16 births ranking #6146. In 2000, approximately 1 in every 165,088 girls born was named Dorthy. FALLING Recent data shows the name is currently falling.