In this Spanish name, the first or paternal surname is Flores and the second or maternal family name is Avendaño.

Colonel Guillermo Flores Avendaño (17 June 1894 – 26 May 1982) was President of Guatemala from 27 October 1957 until 2 March 1958, when he was appointed Minister of Defence in the government of Miguel Ydígoras.

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