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!