Unknown is a distinctive boys' name in United States, ranking #2444 in 1997 with 34 recorded births. The name reached its all-time peak in 2009 with 113 births ranking #1484. Since 1996, the popularity has decreased by 35.8%. In 1997, approximately 1 in every 55,444 boys born was named Unknown. FALLING Recent data shows the name is currently falling.