Unknown is a distinctive boys' name in United States, ranking #3112 in 2003 with 31 recorded births. The name reached its all-time peak in 2009 with 113 births ranking #1484. Since 1996, the popularity has decreased by 41.5%. In 2003, approximately 1 in every 63,718 boys born was named Unknown. FALLING Recent data shows the name is currently falling.