Kj is a distinctive boys' name in United States, ranking #9202 in 2006 with 8 recorded births. This places Kj in the bottom 34% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2021 with 21 births ranking #4705. In 2006, approximately 1 in every 256,890 boys born was named Kj. FALLING Recent data shows the name is currently falling.