Garreth is a distinctive boys' name in United States, ranking #12902 in 2017 with 5 recorded births. This places Garreth in the bottom 10% 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 54.5%. In 2017, approximately 1 in every 370,063 boys born was named Garreth. FALLING Recent data shows the name is currently falling.