Unknown is a distinctive boys' name in United States, ranking #1850 in 2021 with 84 recorded births. The name reached its all-time peak in 2009 with 113 births ranking #1484. Since 1996, the popularity has increased by 58.5%. In 2021, approximately 1 in every 20,812 boys born was named Unknown. FALLING Recent data shows the name is currently falling.