The story
- Proto-Indo-European · derived from*kal-“hard”
- Proto-Celtic · derived from*kaletos
- Latin · derived fromCaletum
- Anglo-Norman · derived fromCaleis
- Middle English · inherited fromCaleys
- French · borrowed fromCalais
- English todayCalais
From French Calais and Middle English Caleys (from Anglo-Norman Caleis), from the Roman name, Latin Caletum, named after the Caleti, a Gaulish tribe in the area, from Proto-Celtic *kaletos, from Proto-Indo-European *kal- (“hard”). The placename is cognate with Breton calet, Middle Irish calath, and calad.
Words from the same roots
Proto-Celtic*kaletos all →
Proto-Indo-European*kal- all →
Etymology from Wiktionary, CC BY-SA 4.0.