Unknown is a distinctive boys' name in United States, ranking #4052 in 2005 with 23 recorded births. The name reached its all-time peak in 2009 with 113 births ranking #1484. Since 1996, the popularity has decreased by 56.6%. In 2005, approximately 1 in every 86,832 boys born was named Unknown. FALLING Recent data shows the name is currently falling.