Unknown is a distinctive boys' name in United States, ranking #3993 in 2006 with 25 recorded births. The name reached its all-time peak in 2009 with 113 births ranking #1484. Since 1996, the popularity has decreased by 52.8%. In 2006, approximately 1 in every 82,205 boys born was named Unknown. FALLING Recent data shows the name is currently falling.