Where does “tat” come from?

tat (Middle Breton) comes from Proto-Brythonic tad, from Proto-Celtic tatos.

Ancestry of “tat”, step by step

StepLanguageWordMeaning
1Proto-Brythonictadfather
2Proto-Celtictatos—

Words derived from “tat”

Every word from Proto-Celtic tatos →Every word from Proto-Brythonic tad →
tat — Etymology, Origin & Word History | Etymology Explorer