Siddhartha is a distinctive boys' name in United States, ranking #9731 in 1999 with 6 recorded births. The name reached its all-time peak in 2015 with 33 births ranking #3419. Since 1996, the popularity has decreased by 40.0%. In 1999, approximately 1 in every 320,015 boys born was named Siddhartha. STABLE Recent data shows the name is currently stable.