Dorthea is a distinctive girls' name in United States, ranking #18071 in 2009 with 5 recorded births. The name reached its all-time peak in 1996 with 10 births ranking #8337. Since 1996, the popularity has decreased by 50.0%. In 2009, approximately 1 in every 367,374 girls born was named Dorthea. RISING Recent data shows the name is currently rising.