Garreth is a distinctive boys' name in United States, ranking #9020 in 2015 with 8 recorded births. This places Garreth in the bottom 36% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 1998 with 18 births ranking #3900. Since 1996, the popularity has decreased by 27.3%. In 2015, approximately 1 in every 239,532 boys born was named Garreth. FALLING Recent data shows the name is currently falling.