Where does “cartaigh” come from?

cartaigh (Irish) comes from Irish cárt, from English quart, from Latin quārtus, from Proto-Indo-European kʷeturtos, from Proto-Indo-European kʷetwóres, from Proto-Indo-European kʷe- — and.

Ancestry of “cartaigh”, step by step

StepLanguageWordMeaning
1Irishcárta quart unit of liquid measurement equivalent to two pints
2EnglishquartA unit of liquid capacity equal to two pints;...
3Latinquārtusfourth
4Proto-Indo-Europeankʷeturtos—
5Proto-Indo-Europeankʷetwóresfour
6Proto-Indo-Europeankʷe-and
Every word from Proto-Indo-European kʷe- →Every word from Proto-Indo-European kʷetwóres →Every word from Proto-Indo-European kʷeturtos →