Lingua franca actually comes from the Mediterranean Lingua Franca [1], which was mostly derived from Northern Italian languages, not French. French eventually became the "lingua franca," but it wasn't widespread (or even clearly defined) when that term started being used.
Lingua franca actually comes from the Mediterranean Lingua Franca [1], which was mostly derived from Northern Italian languages, not French. French eventually became the "lingua franca," but it wasn't widespread (or even clearly defined) when that term started being used.
[1]: https://en.wikipedia.org/wiki/Mediterranean_Lingua_Franca