Sepp is a distinctive boys' name in United States, ranking #13875 in 2012 with 5 recorded births. This places Sepp in the bottom 3% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2012 with 5 births ranking #13875. In 2012, approximately 1 in every 379,325 boys born was named Sepp. STABLE Recent data shows the name is currently stable.