Valdemar is a distinctive boys' name in United States, ranking #10675 in 2018 with 7 recorded births. The name reached its all-time peak in 2002 with 24 births ranking #3664. Since 1996, the popularity has decreased by 46.2%. In 2018, approximately 1 in every 259,353 boys born was named Valdemar. STABLE Recent data shows the name is currently stable.