The story
- Gaulish · derived fromkassanos“oak”
- Vulgar Latin · derived from*cassanus
- English todayChesney
From Norman place names meaning “oak grove” (cognate to French chênaie), from Picard quesne, from Vulgar Latin *cassanus, probably from Gaulish kassanos (“oak”).
Etymology from Wiktionary, CC BY-SA 4.0.