(Que sera in Brasilian Portuguese means 'what is that', or 'what may it be').
----------------------------------

"Que sera sera" first appeared in the film, "The Barefoot Contessa." The family motto of the character played by Rossano Brazzi was "Che Sera Sera," but Herrmann, Evans and Livingston changed it to 'que' because more Americans were familiar with Spanish.
They should have checked because using Que for 'what ever' is pidgin Spanish at best.

Christopher Marlowe, the English playwright, used the phrase in his play "Dr Faustus," 1588: "What doctrine is this? Che sera, sera" (what will be, shall be).

See the Gutenberg online book, "The Tragical History of Doctor Faustus."
Doctor Faustus