Giotto

It is also possible that Giotto is a contracted (short) form of Angiolotto, which is a diminutive of Angiolo, as it contains the Italian masculine diminutive suffix -otto:

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- https://en.wikipedia.org/wiki/List_of_diminutives_by_language#Italian (in English)
- https://en.wiktionary.org/wiki/-otto (in English)

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Also see the entry for the name Giotto on the Italian Wikipedia, which mentions Angiolotto as one of the possibilities:

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- https://it.wikipedia.org/wiki/Giotto_(nome) (in Italian) [noted -ed]

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Alternatively, the name might be a contracted (short) form of Giosafatto or Giosefatto, which is a variant form of Giosafat, the Italian form of the biblical given name Josaphat:

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- https://it.wikipedia.org/wiki/Giosafat_(nome) (in Italian).