Giorno Giovanna as he was when he was a child. It was his birth name before he had it legally changed by his parents.
Generally the tag will refer to Giorno with black hair in a bowl cut, and sometimes a black or blue gakuran when he is a teenager. "Giorno" as we know him, by contrast, is generally considered to be the blond medium haired youth he became when his powers awakened subconsciously.
This tag implicates giorno_giovanna (learn more).