Where does “chaisne” come from?

chaisne (Old French) comes from Latin cassanus, from Gaulish cassanos, from Gaulish cass-, from Proto-Celtic kassos — curly, twisted, woven.

Ancestry of “chaisne”, step by step

StepLanguageWordMeaning
1Latincassanus—
2Gaulishcassanosan oak; oak
3Gaulishcass-twist’
4Proto-Celtickassoscurly, twisted, woven
Every word from Proto-Celtic kassos →Every word from Gaulish cass- →Every word from Gaulish cassanos →