Where does “llobregatenc” come from?

llobregatenc (Catalan) comes from Catalan Llobregat, from Latin Rubricatus, from Latin rubricare, from Latin rubrīca, from Latin ruber, from Proto-Italic ruðros, from Proto-Indo-European h₁rudʰrós, from Proto-Indo-European h₁rewdʰ- — red.

Ancestry of “llobregatenc”, step by step

StepLanguageWordMeaning
1CatalanLlobregat
2LatinRubricatusnow Llobregat
3Latinrubricarepresent active infinitive of rubrīcō;...
4Latinrubrīcared ochre, ruddle red earth for coloring
5Latinruberred approximately like red ochre (which had a traditional status among the Romans); red that was both common and dignified, somewhat associated with pigment
6Proto-Italicruðrosred
7Proto-Indo-Europeanh₁rudʰrósred
8Proto-Indo-Europeanh₁rewdʰ-red
Every word from Proto-Indo-European h₁rewdʰ-Every word from Proto-Indo-European h₁rudʰrósEvery word from Proto-Italic ruðros