It should derive from the medieval name Ghino (hypocoristic name such as Arrighino and Ughino).
An example of the use of this name in Florence can be found in a text preserved in the State Archives of Florence: "...In Dei nomine amen. Anno Domini millesimo trecenteximo quadrageximo quarto, indictione xii, die primo mensis maii. .. ... emancipatus a dicto patre suo, ut contineri dixit in carta facta manu ser Ghini Sozzi de Senis notarii ...".
Traces of this surname can be found in Florence in 1300 with Giovanni di Lapo Ghini.
The surname Ghini is specific to the area that includes Emilia and Tuscany.
Ghin, very rare, is typical of the Marano area (UD).
Ghinassi has a lineage in the province of Ravenna and one in that of Arezzo.
These sources are essential for initiating the understanding of ghinassi, and at the same time, of surnames in general.