The story
- French · derived fromaïeul“grandfather”
- Latin · derived fromtris
- Middle French · borrowed fromtrisayeul
- English todaytresayle
From Middle French trisayeul, from Latin tris, tres (“three”) + French aïeul (“grandfather”). Compare besaiel, and see ayle.
Etymology from Wiktionary, CC BY-SA 4.0.