Trajan is a distinctive boys' name in United States, ranking #5487 in 2015 with 17 recorded births. The name reached its all-time peak in 1999 with 141 births ranking #1001. Since 1996, the popularity has increased by 112.5%. In 2015, approximately 1 in every 112,721 boys born was named Trajan. FALLING Recent data shows the name is currently falling.