Typical of western Sardinia and Cagliari, of obscure etymology and probably Spanish origins, we find this surname since the 1200s counted among the noble families, when Giovanni Chiano de Bas-Serra the King of Arborea, one of the 4 states in which the Sardinia, married the wealthy wealthy Vera Cappai daughter of the banker Count Johanni Perra de Cappai, in 1667 Bonifacio Cappai was awarded with the title of Don, Hereditary Knight and Noble Sardinian. additions provided by Giovanni Vezzelli The Cappai surname is Sardinian, it could correspond to the family plural of a supposed Tuscan word * cappaio = hood maker. M. Pittau, Dictionary of Surnames from Sardinia, 1, p. 174.
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