Pj is a distinctive boys' name in United States, ranking #12743 in 2004 with 5 recorded births. This places Pj in the bottom 4% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2008 with 9 births ranking #8837. In 2004, approximately 1 in every 396,960 boys born was named Pj. FALLING Recent data shows the name is currently falling.