Unknown is a distinctive boys' name in United States, ranking #2475 in 2000 with 39 recorded births. The name reached its all-time peak in 2009 with 113 births ranking #1484. Since 1996, the popularity has decreased by 26.4%. In 2000, approximately 1 in every 50,357 boys born was named Unknown. FALLING Recent data shows the name is currently falling.