Garreth is a distinctive boys' name in United States, ranking #4748 in 2001 with 16 recorded births. This places Garreth in the top 39% 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 increased by 45.5%. In 2001, approximately 1 in every 121,427 boys born was named Garreth. FALLING Recent data shows the name is currently falling.