Calassi is absolutely rare, and we should deal with subsequent modifications to erroneous transcriptions of the surname Calasso, which is typically Salento, of the Taranto area, of Brindisi and of Lecce, of Copertino in the Lecce area and of Lizzano in the Taranto area above all, it should be an altered form of the medieval name Galassus (see GALASSI).
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