Unknown is a distinctive boys' name in United States, ranking #2757 in 2025 with 47 recorded births. The name reached its all-time peak in 2009 with 113 births ranking #1484. Since 1996, the popularity has decreased by 11.3%. In 2025, approximately 1 in every 36,342 boys born was named Unknown. FALLING Recent data shows the name is currently falling.