Unknown is a distinctive boys' name in United States, ranking #1967 in 2008 with 73 recorded births. The name reached its all-time peak in 2009 with 113 births ranking #1484. Since 1996, the popularity has increased by 37.7%. In 2008, approximately 1 in every 27,944 boys born was named Unknown. FALLING Recent data shows the name is currently falling.