Typical of the Palermo area, of Altofonte and Palermo in particular, it should derive from nicknames originating from the progenitor's physical characteristics. (see Nigro)
Nigra is typically Piedmontese, from Turin, San Giusto Canavese, Castellamonte, Ozegna and Mercenasco in Turin and Vercelli, with ancient presences in the Cosenza area, Nigri has a stock in Puglia in Foggia, in Martina Franca in the Taranto area and in Bari and Bisceglie in the Bari area , a strain in Catanzaro and a very small one in Taormina in Messina, Nigro is widespread throughout the south. Campania, Basilicata, Puglia, Calabria and south-eastern Sicily, should derive from a nickname originated from the Latin term niger (black, dark), suggested probably by the dark complexion of the family, or by the dark color of the hair, in Crotone for example the Nigro derived from the Negro slaves converted to Christianity find traces of it for the construction of the fortifications of the cities and castle of Crotone, whose works began in the spring of 1541, the Nigro that appear are a few dozen; in a parish census of 1658 we read: "... Pietro Paulo Nigro (nigro slave) of the Most High Lord, patron of 80 years and Laura, daughter, same Negro virgin of 26 years ...".
Verba Volant, Scripta Manent