Save Type Surname (from nickname) Usage Spanish (Philippines) Pronounced Pron. /ʔɪ.lʊs.ˈtɾi.sɪ.mo/(Filipino Spanish) [key·simplify] Other Forms FormsIllustrisimo, Elustrisimo, Ellustrisimo, Ilustricimo, Illustricimo Meaning & History Derived from Spanish ilustrísimo meaning "most illustrious".