Trejohn is a distinctive boys' name in United States, ranking #11351 in 2005 with 6 recorded births. This places Trejohn in the bottom 15% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 1999 with 9 births ranking #7078. In 2005, approximately 1 in every 332,858 boys born was named Trejohn. FALLING Recent data shows the name is currently falling.