Unknown is a distinctive boys' name in United States, ranking #1597 in 2012 with 99 recorded births. The name reached its all-time peak in 2009 with 113 births ranking #1484. Since 1996, the popularity has increased by 86.8%. In 2012, approximately 1 in every 19,158 boys born was named Unknown. FALLING Recent data shows the name is currently falling.