Etymology
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Barnabas 
surname of Joseph the Levite of Cyprus (Acts iv.36), literally "son of exhortation," from Aramaic (Semitic) bar "son" + nabha "prophecy, exhortation." St. Barnabas' Day (colloquially St. Barnaby), June 11, in the Old Style calendar was reckoned the longest day of the year (Barnaby the Bright).
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Cassandra 

fem. proper name, from Greek Kasandra, Kassandra, daughter of Priam and Hecuba of Troy, seduced by Apollo who gave her the gift of prophecy, but when she betrayed him he amended it so that, though she spoke truth, none would believe her. Used figuratively since 1660s.

The name is of uncertain origin, though the second element looks like a fem. form of Greek andros "of man, male human being." Watkins suggests PIE *(s)kand- "to shine" as source of second element. The name also has been connected to kekasmai "to surpass, excel," and Beekes suggests a source in PIE *(s)kend- "raise."

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