Ferighetto is almost unique, Ferrighetto, however absolutely rare, would seem to be from Belluno, Ferighi is almost unique to the Rovigoto, as is the less rare Ferrighi which is also present in the Verona area, Ferigo is typical of the upper Udine area of Paularo, Ferrigo, very much rare, it is from the Paduan area, they should all derive, directly or through hypocoristic forms, from the contraction of the name Federigo, we have an example in Rovinj where in 1740/41 a certain Ferigo Bonlini is podestà , but it is also possible a connection with a nickname connected with iron working.
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