Valdar was the name of one or several legendary Danish kings.
Hversu Noregr byggdist
According to Hversu Noregr byggdist, a Valdar was the son of Roar (Hroðgar) of the house of Skjöldung (Scylding). This source makes Valdar the father of Harald the Old, the father of Halfdan the Valiant, the father of Ivar Vidfamne. If he is of the same origin as the Valdar of Hervarar saga, this account adds four generations (Harald the Old, Halfdan the Valiant, Ivar Vidfamne and effectively Ivar's daughter Alfhild/Auðr who was Harald Wartooth's mother according to all accounts) between Valdar and Harald Wartooth, who was Valdar's son according to the Hervarar saga.
Skjöldunga saga
The Skjöldunga saga tells that a Valdar disputed that Rörek, the cousin of Helgi (Halga) succeeded Hrólfr Kraki (Hroðulf) as the king of the Daner. After the war, Rörek took Zealand, while Valdar took Skåne. If based on the same tradition as Hversu Noregr byggdist, Valdar had the right to claim the throne being the son of the former king Hróarr (Hroðgar).
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