One early reference to a prominent historical figure, named Walther Von Der Vogelweide, provides a lead towards understanding the etymology, of WALT(H)ER.

Said to have been born in the year 1170, and to have lived until 1230, Walther of the Bird Pasture, exerted a unique voice, which has stood the test of time.

*Note: The statue of Walther Von Der Vogelweide, was made in 1877, and it is an imagined depiction of Walther Von Der Vogelweide.