Dorthea is a distinctive girls' name in United States, ranking #15020 in 2005 with 6 recorded births. The name reached its all-time peak in 1996 with 10 births ranking #8337. Since 1996, the popularity has decreased by 40.0%. In 2005, approximately 1 in every 307,950 girls born was named Dorthea. RISING Recent data shows the name is currently rising.