Where does “réasúnaigh” come from?

réasúnaigh (Irish) comes from Irish réasún, from Middle Irish résún, from Anglo-Norman raisun, from Old French reson, from Latin ratiō, from Latin -tiō, from Latin dissertātiō, from Latin dissertus — small stone, pebble; gravel, rubble.

réasúnaigh (Irish): to reason, rationalize

Definitions

to reason, rationalize

Ancestry of “réasúnaigh”, step by step

Step	Language	Word	Meaning
1	Irish	réasún	reason, reasoning faculty; reasonableness, sense;...
2	Middle Irish	résún	reason
3	Anglo-Norman	raisun	Alternative form of reson
4	Old French	reson	logic, logical reasoning
5	Latin	ratiō	reason, reasoning, explanation, ground, motive, rationality, rationale, purpose
6	Latin	-tiō	tion, -ation, -ing
7	Latin	dissertātiō	(spoken) dissertation, discourse, disquisition
8	Latin	dissertus	arranged, disposed; explained
9	Latin	disserere	second-person singular future passive indicative...
10	Latin	dis-	asunder, apart, in two; reversal, removal;...
11	Latin	calceus	shoe
12	Latin	calx	limestone; chalk; the finish line
13	Ancient Greek	χάλιξ	small stone, pebble; gravel, rubble

Words derived from “réasúnaigh”

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