Greco group, a group of grape varieties which can be challenging to understand.
While some varieties bearing ‘Greco’ in their name were imported from Greece, many were not. The Greco reference in a grape name was popular, and some inventive spellings of it were added to the mix, eg Grechetto, Grecanico. To set the straight Grecos apart from each other, their colour (‘giallo’ or ‘bianco’ meaning yellow or white respectively) or an associated town of origin (di Tufo, d’Ischia) might have been added to their name. This popularity led to quite a collection of Greco-named varieties, almost all of which are unrelated.
Italian Wine Unplugged (Positive Press, 2017), p47.