The diffusion is quite vast and there are many areas of rooting, in the province of Caserta, Catanzaro, Bari and in the area between the provinces of Pavia, Lodi, Milan and Cremona. The derivations are multiple, the origin of the northern surnames, should refer to characteristics of locality, in dialect conca (closed) it indicates the mechanism of regulation of the waters of a channel. Southern surnames are more likely to come from nicknames linked to toponyms such as: Conca Casale (IS), Conca d'Oro (TA), Conca dei Marini (SA) and Conca della Campania (CE).
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