Over the years, people have spelled it 'deTomaso, De Tomaso, and DeTomaso- even De Tomasso. Decades ago I sent Allessandro a Nor-Cal Panteras tee shirt for his birthday and got a nice card back from him (pre-stroke) signed "A. DeTomaso" . I also got a Christmas card one time from Isobella- signed "DeTomaso"