迪安·
维特 is the standard transliteration of "Dean Witter" — both the name of broker Dean G. Witter (1887-1969) and the firm Dean Witter Reynolds, which merged with Morgan Stanley in 1997.
迪安 = "Dean" (also a name in CC-CEDICT for
维特 "Werther/Witter"). The middle dot · separates given name from surname.