funnily enough, the relation comes from a french jurist's last name
from their repo: https://github.com/CatalaLang/catala
> The language is named after Pierre Catala, a professor of law who pionneered the French legaltech by creating a computer database of law cases, Juris-Data.
Name that is almost certainly related to Catalonia as well.
Also in their website https://catala-lang.org/en/about#naming