Unknown is a distinctive boys' name in United States, ranking #1602 in 2013 with 97 recorded births. The name reached its all-time peak in 2009 with 113 births ranking #1484. Since 1996, the popularity has increased by 83.0%. In 2013, approximately 1 in every 19,497 boys born was named Unknown. FALLING Recent data shows the name is currently falling.