The suffix "-iello" of the surname Minichiello, is one of those suffixes such as "-ino", "-one", and "-etto", which give a particular flavor and meaning to nouns and adjectives to which they are attached. Since the Middle Ages, they were and are used with first names to indicate size, age, affection, physical and moral qualities, and have for the most part developed inside the family circle as pet names.
The suffix "-iello" in the surname Minichiello is similar to other suffixes like "-ino", "-one", and "-etto," which add a specific flavor and meaning to words they are attached to. Since medieval times, these suffixes have been used with first names to denote size, age, affection, physical and moral traits, and primarily within the family as endearing nicknames.