Demetrius is a moderately popular boys' name in United States, ranking #377 in 1998 with 670 recorded births. The name reached its all-time peak in 1996 with 759 births ranking #338. Since 1996, the popularity has decreased by 11.7%. In 1998, approximately 1 in every 2,853 boys born was named Demetrius. FALLING Recent data shows the name is currently falling.