Valdemar is a distinctive boys' name in United States, ranking #7099 in 1999 with 9 recorded births. The name reached its all-time peak in 2002 with 24 births ranking #3664. Since 1996, the popularity has decreased by 30.8%. In 1999, approximately 1 in every 213,343 boys born was named Valdemar. STABLE Recent data shows the name is currently stable.