Letha is a distinctive girls' name in United States, ranking #10535 in 2007 with 11 recorded births. The name reached its all-time peak in 1996 with 17 births ranking #5674. Since 1996, the popularity has decreased by 35.3%. In 2007, approximately 1 in every 174,768 girls born was named Letha. FALLING Recent data shows the name is currently falling.