South Dakota Administrative Rules — Title 64 (Revenue)
ARSD § 64:28:01:03 — Legal name required -- Appearance on title and registration
64:28:01:03 . Legal name required--Appearance on title and registration . On a vehicle title application, all owners of the vehicle shall provide their full legal name, including middle name. The full legal name provided must match the name on each owner's United States or state issued identification document.
The department or the country treasurer shall place each owner's full legal name on the vehicle title and registration.
Source: official text