O Fortuna is a poem written in the 13th century, part of Carmina Burana (a collection of 254 poems).
In 1935–36, this poem was “brought to life” by the German composer Carl Orff. Yes, I’m sure you’ve heard it before.
This term comes from the ancient Greek word βάρβαρος (read barbaros). It’s an onomatopoeic word representing the sounds “bar bar bar”, which was what the Greeks heard when non-Greeks were speaking.
Some people say that the female given name “Barbara” means “barbarian woman”.