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Cosmai is typical of Bisceglie in the Bari area, it should derive from the Greek name Kosmas, but a probable derivation from the Norman name Gossmann should also be taken into consideration, given the considerable Slavic presence on site one cannot even overlook a derivation from a nickname originated from the word Slavic kosmac (hairy, bearded man), traces of this surname can be found in the Bari area since the 1600s.
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