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Michelino is a typical patronymic based on a diminutive. - ino is a typical Italian diminutive suffix ("little Michele").
Not easy to find the area of origin because Michelino is Italian and not related to any dialectal form. Anyhow later I look in the books I own.
I already told you, it's not the surname of that dude from Florence.
"Il suo vero nome era Domenico di Francesco, ma assunse lo pseudonimo di Michelino per una sua attività giovanile svolta presso un lavoratore di avorio chiamato Michelino di Benedetto".
His real name was Domenico di Francesco but "di Francesco" in Tuscany is not a surname (the derived surname in Tuscany is Franceschi), in Tuscany "di Francesco", especially in the Middle ages, is an "agnatizio" that indicates "agnatic kinship" (not stricly related to primogeniture though), surely not a surname.
Di Michelino was a pseudonym based on the name of his old and first magister, so not even based on patrilineality.
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