Garreth is a distinctive boys' name in United States, ranking #7696 in 2000 with 8 recorded births. The name reached its all-time peak in 1998 with 18 births ranking #3900. Since 1996, the popularity has decreased by 27.3%. In 2000, approximately 1 in every 245,492 boys born was named Garreth. FALLING Recent data shows the name is currently falling.