Garreth is a distinctive boys' name in United States, ranking #12886 in 2012 with 5 recorded births. The name reached its all-time peak in 1998 with 18 births ranking #3900. Since 1996, the popularity has decreased by 54.5%. In 2012, approximately 1 in every 379,325 boys born was named Garreth. FALLING Recent data shows the name is currently falling.