Unknown is a distinctive girls' name in United States, ranking #3468 in 2023 with 46 recorded births. The name reached its all-time peak in 2009 with 84 births ranking #2334. Since 1996, the popularity has decreased by 13.2%. In 2023, approximately 1 in every 34,840 girls born was named Unknown. STABLE Recent data shows the name is currently stable.