From Ferrari Wiki
Alfredo Ferrari (January, 1932 – June 30, 1956), nicknamed Alfredino or Dino, was the only legitimate son of Enzo Ferrari. Enzo decided to name Alfredo after his grandfather.
From an early age Enzo was grooming his son to be his successor, and therefore sent him to some of the best schools in Europe. Dino studied engineering in Switzerland. Dino suggested to Enzo Ferrari the development of a 1.5 L DOHC V6 engine for F2 at the end of 1955. Soon afterwards, Alfredo fell ill, suffering from Muscular dystrophy. While in hospital, he discussed technical details with the engineer Vittorio Jano. Dino would never see the engine; he died on June 30, 1956 at the age of only 24, before his namesake automobiles Fiat Dino and Dino (cars) were produced.
The Autodromo Enzo e Dino Ferrari in Italy was originally named in his honour alone; Enzo's name was added after his own death in 1988.