Folena is very rare, probably originating from Livorno, Foleni, almost unique, probably due to transcription errors, should derive from nicknames originated from the dialectal term folena (favilla, but also soot), perhaps due to characteristics due to the ancestor's profession, for example the chimney sweep, or even it is possible from physical characteristics such as a particularly dark complexion, the dialectal term folena or fulena also has a second meaning that is that of a lively boy, always in movement and from these characteristics the surname could also be derived.
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