Where does “cathau” come from?

cathau (Welsh) comes from Welsh cath, from Proto-Brythonic kaθ, from Proto-Celtic kattā, from Proto-Germanic *kattǭ, from Latin catta, from Latin cattus — a cat.

Ancestry of “cathau”, step by step

StepLanguageWordMeaning
1Welshcathcat; wildcat; cat, tipcat; cat-o'-nine-tails
2Proto-Brythonickaθcat
3Proto-Celtickattācat
4Proto-Germanic*kattǭfemale cat
5Latincattaa cat
6Latincattusa cat
Every word from Latin cattus →Every word from Latin catta →Every word from Proto-Germanic *kattǭ →