Gareth is a moderately popular boys' name in England & Wales, ranking #250 in 2001 with 113 recorded births. The name reached its all-time peak in 1996 with 373 births ranking #117. Since 1996, the popularity has decreased by 69.7%. In 2001, approximately 1 in every 2,547 boys born was named Gareth. FALLING Recent data shows the name is currently falling.