Where does “llygoden” come from?

llygoden (Welsh) comes from Welsh llygod, from Proto-Brythonic llugod, from Celtic *lukūts.

Ancestry of “llygoden”, step by step

StepLanguageWordMeaning
1Welshllygodmice
2Proto-Brythonicllugodplural of *llug
3Celtic*lukūts—
Every word from Celtic *lukūts →Every word from Proto-Brythonic llugod →Every word from Welsh llygod →