‘Yannopoulos’ or 'Giannopoulos' is a Greek surname (pronounced 'Ya-No-Pu-Los') from Yannis, vernacular form of Iōannēs ‘John’ + the patronymic ending -poulos. This ending occurs mainly in the Peloponnese; it is derived from Latin pullus (‘nestling’, ‘chick’).

 

You can find a simple genealogical tree at the downloads section, tracing the roots of the Yannopoulos family back to the 1800's. The full version (not available online) includes 8 generations, 206 family members and 81 different surnames related to A. Yannopoulos.