Where does “Montréal” come from?

Montréal (French) comes from Middle French Montreal, from Middle French real, from Old French reel, from Latin reālis, from Latin rēs, from Latin vindicatio, from Latin vindicō, from Latin vindex — small stone, pebble; gravel, rubble.

Ancestry of “Montréal”, step by step

Montréal traces back through two separate lines of ancestry.

via Middle French Montreal

Step	Language	Word	Meaning
1	Middle French	Montreal	at its confluence with the Ottawa River
2	Middle French	real	royal; Alternative form of royal
3	Old French	reel	—
4	Latin	reālis	real
5	Latin	rēs	thing, object, stuff
6	Latin	vindicatio	civil lawsuit; protection, defence; vindication;...
7	Latin	vindicō	to lay claim to as one's own (often with sibi)
8	Latin	vindex	claimant, vindicator
9	Latin	dīcō	to say, talk, speak, utter, mention
10	Latin	-tiō	tion, -ation, -ing
11	Latin	dissertātiō	(spoken) dissertation, discourse, disquisition
12	Latin	dissertus	arranged, disposed; explained
13	Latin	disserere	second-person singular future passive indicative...
14	Latin	dis-	asunder, apart, in two; reversal, removal;...
15	Latin	calceus	shoe
16	Latin	calx	limestone; chalk; the finish line
17	Ancient Greek	χάλιξ	small stone, pebble; gravel, rubble

via French Mont Royal

Step	Language	Word	Meaning
1	French	Mont Royal	Mount Royal

Words derived from “Montréal”

Every word from Ancient Greek χάλιξ →Every word from Latin -tiō →Every word from Latin dis- →