Cassisa, very rare and specific to Trapani, Cassisi, probably from Messina, is distributed on the south-eastern coast of Sicily, of uncertain origin, could have been born from a nickname derived from the Latin word cassis (elmo) or from another Latin word cassis (hunting net ) or could define belonging to the Cassia gens. integration provided by Giovanni Vezzelli Cassisi is a surname of eastern Sicily that derives from the dialect word 'cassisi' = long, tall. Rohlfs 65.
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