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There is Roman family name Caesidius which is probably the origin of the Italian given name Cesidio.

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For Cesidio several Italian name websites (in Italian) give a meaning of "pale", e.g. this one which also mentions a saint with the name:
http://www.santiebeati.it/nomi/Detailed/1782.html

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I have no idea how reliable this information is, however.

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