Where does “Calais” come from?

Calais (Portuguese) comes from French calais, from French caler, from Old Occitan calar, from Ancient Greek χαλάω — I slacken; I loosen; I become slack; I become...

Ancestry of “Calais”, step by step

Step	Language	Word	Meaning
1	French	calais	first-person singular imperfect indicative of...
2	French	caler	to wedge (open) (a door)
3	Old Occitan	calar	—
4	Ancient Greek	χαλάω	I slacken; I loosen; I become slack; I become...

Every word from Ancient Greek χαλάω →Every word from Old Occitan calar →Every word from French caler →