Casasola is typical of the Udine area and should derive from the toponym Casasola di Frisanco (PN) or from Casasola di Maiano (UD), Casasole, very rare, is specific to Orvieto, Casasoli is almost unique. additions provided by Fabio Paolucci Casasole is a typical surname of Orvieto, where it is widely recorded, and of a few other neighboring municipalities (Castel Viscardo, Allerona Scalo, Ciconia, Sferracavallo, Porano and Castel Giorgio), but it is not detectable even in other regions (Lazio, Emilia Romagna, Piedmont, Marche and Molise). The place of origin of the surname would seem to be Orvieto, still today the epicenter of diffusion. From an etymological point of view, Casasole derives from the fusion of the two terms house and sun, in relation to a toponym or to the place where the progenitor of the stock resided. There seems to be no correlation with the surname Sole, typical of Sicily, Sardinia, Campania, Lazio and Lombardy, and with the surname Casa, which has two main stocks in Rome and the Neapolitan area. Both Casa and Sole are not Umbrian surnames. A variant of Casasole is Casasoli, due to incorrect registry data. Casasola, on the other hand, seems to have a completely isolated origin, being typical of Friuli Venezia Giulia and eastern Veneto.
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