“than less appealing names like Schmutz (dirt)”
Or their German masters thought it was funny:
Einstein (one balled)
Einstein might also be translated as “monolith”.
More likely than not, Einstein is a German place name, like London or Kent in England. Many German Jews had assumed ordinary Germans names the same way other Germans did, by profession or place of birth. Names like Rosenthal and Rosenberg are “Jewish” because it was unusual for German gentiles to have them.