Demetrius is a moderately popular boys' name in United States, ranking #391 in 1999 with 650 recorded births. The name reached its all-time peak in 1996 with 759 births ranking #338. Since 1996, the popularity has decreased by 14.4%. In 1999, approximately 1 in every 2,954 boys born was named Demetrius. FALLING Recent data shows the name is currently falling.