Garreth is a distinctive boys' name in United States, ranking #4774 in 2002 with 16 recorded births. The name reached its all-time peak in 1998 with 18 births ranking #3900. Since 1996, the popularity has increased by 45.5%. In 2002, approximately 1 in every 121,342 boys born was named Garreth. FALLING Recent data shows the name is currently falling.