The bloodline of todays spainish bulls have their origin from 5 breeds. One line is the Cabrera bulls. Cabrera males were purchased by D Jaun Miura for the Miura Ranch around 1850. They were well respected and regarded as pure breed which I surmise is some reasons why Ferruccio chose the name.

Ferruccio spoke about visiting the Miura Ranch in the early 60's with then owner Eduardo Miura prior to forming his car company.

-mick