Quick answer
Valdemar is a boy name.
Pronunciation: Finnish /ˈʋɑl.de.mɑr/.
Meaning and history
Scandinavian form of Waldemar, also used as a translation of the Slavic cognate Vladimir. This was the name of four kings of Denmark and a king of Sweden. It was introduced to Scandinavia by the 12th-century Danish king Valdemar I who was named after his mother's grandfather: Vladimir II, a grand prince of Kievan Rus.
Notes and context
Usage: danish, swedish, finnish, portuguese