The Spanish for “deaf,” sordo, comes from the Latin for the same: sordus.
From that same root is the English… absurd.
How did this abs… umm, ridiculous etymology come about? Well, with the ab– prefix (Latin for “off” or “away from”), it meant, “that which is unheard of.” Think of it as a metaphorical version of being deaf: so absurd, you never heard about that happening in reality!
This, this is self-referential: it is an absurd etymology!