Unknown is a distinctive boys' name in United States, ranking #1484 in 2009 with 113 recorded births. This places Unknown in the top 10% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2009 with 113 births ranking #1484. Since 1996, the popularity has increased by 113.2%. In 2009, approximately 1 in every 17,551 boys born was named Unknown. FALLING Recent data shows the name is currently falling.