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Amazon (n.): late 14c., from Greek Amazon (mostly in plural Amazones) "one of a race of female warriors in Scythia," probably from an unknown non-Indo-European word, possibly from an Iranian compound *ha-maz-an- "(one) fighting together" [Watkins], but in folk etymology long derived from a- "without" + mazos "breasts," hence the story that the Amazons cut or burned off one breast so they could draw bowstrings more efficiently.

The river in South America (originally called by the Spanish Rio Santa Maria de la Mar Dulce) rechristened by Francisco de Orellana, 1541, after an encounter with female warriors of the Tapuyas (or, as some say, beardless, long-haired male tribesmen; still others hold that the name is a corruption of a native word in Tupi or Guarani meaning "wave").
blazon (n.): "coat of arms," late 13c., from Old French blason (12c.) "a shield, blazon," also "collar bone;" common Romanic (compare Spanish blason, Italian blasone, Portuguese brasao, Provençal blezo, the first two said to be French loan-words); of uncertain origin. OED doubts, on grounds of sense, the connection proposed by 19c. French etymologists to Germanic words related to English blaze (n.1).
blazon (v.): 1560s, "to depict or paint (armorial bearings)," from blazon (n.) or else from French blasonner. Earlier as "to set forth decriptively" (1510s); especially "to vaunt or boast" (1530s), in this use probably from or influenced by blaze (v.2).
emblazon (v.): "inscribe conspicuously," also "extol," 1590s, from assimilated form of en- (1) + blazon. Related: Emblazoned; emblazoning.