Surprising nobody corrected you.
The name is DIAKOPOULOS. Diakos is a "Junior" priest.
A child of Diakos IS DIAKOPOULOS the same way as a child of a Priest is Pappadopoulos.
Daico is a Japanese word. Also (if I am right) the name of Japanese vegetable.
Alternativelly (but highly unlikely) the name could be Dekopoulos (AI = E; E like in Peloponnese)
The name NOVIS is also highly questionable. I am not saying it does not exist but if it does exist than it is a highly modified version of the original name which was probably Venetian (perhaps Novello?)