Valdemar is a distinctive boys' name in United States, ranking #7555 in 2010 with 11 recorded births. The name reached its all-time peak in 2002 with 24 births ranking #3664. Since 1996, the popularity has decreased by 15.4%. In 2010, approximately 1 in every 174,401 boys born was named Valdemar. STABLE Recent data shows the name is currently stable.