Klāvs Siliņš: Latviesu personvārdu vārdnīca. Riga "Zinātne" 1990, ISBN 5-7966-0278-0
Population Register of Latvia: Valdemārs was the only given name of 163 persons in Latvia on May 21st 2010.
Etymology
First recorded as a given name of Latvians in the end of 19th century. Ultimately from Old High German. Cognate to German Waldemar and Danish Valdemar.