Mildreth is a distinctive girls' name in United States, ranking #14892 in 2008 with 7 recorded births. This places Mildreth in the bottom 27% of ranked US girls' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2008 with 7 births ranking #14892. In 2008, approximately 1 in every 270,103 girls born was named Mildreth. FALLING Recent data shows the name is currently falling.