Valdemar is a distinctive boys' name in United States, ranking #6075 in 1997 with 10 recorded births. The name reached its all-time peak in 2002 with 24 births ranking #3664. Since 1996, the popularity has decreased by 23.1%. In 1997, approximately 1 in every 188,509 boys born was named Valdemar. STABLE Recent data shows the name is currently stable.