Delta is a distinctive girls' name in United States, ranking #10157 in 2009 with 11 recorded births. The name reached its all-time peak in 2019 with 136 births ranking #1571. Since 1996, the popularity has decreased by 31.3%. In 2009, approximately 1 in every 166,988 girls born was named Delta. FALLING Recent data shows the name is currently falling.