Earlier quoted context omitted.
Germany used to be extremely restrictive about the set of character sequences that were allowed as given names. Some of that is probably still in place. When everybody was called Fritz or Hans or Gundula plus some word describing an ancestor's profession (it's all following the pattern of Smith and Miller), the order didn't really matter and that freedom was liberally abused: contexts that use the formal as identifie…
When I was a child in Bavaria I was often called by house name + given name, in that order, especially by the elderly. The house name is different from the family name which appears in official documents like the birth certificate. Another difference between northern and southern Germany is the Münchner-Du and the Hamburger-Sie. In standard German we use the formal pronoun Sie with the last name in formal situations…
Two notes:
First, you'd use "thou" here, as it's the nominative case, and the correct conjugation would be "canst".
Secondly, "thee" and "thou" were very much the form used to speak to a close friend or social inferior in early modern English. "You" functioned more like French "vous" or German "Sie"- as either a plural formation or a formal address of a social superior.
With that in mind, it would probably be more accurate to say that they should be rendered "Marcus, can you get the car, please?" and "Mrs. Miller, canst thou get the car, please?" And notice the parallel between "canst thou" and "kannst Du"!