Where does “beannachd” come from?

beannachd (Scottish Gaelic) comes from Old Irish bennacht, from Old Irish bendacht, from Latin benedictiō, from Latin Benedictus, from Latin benedīcō, from Latin dīcō, from Latin -tiō, from Latin dissertātiō — small stone, pebble; gravel, rubble.

beannachd (Scottish Gaelic): blessing; greeting, regards

Definitions

blessing; greeting, regards

Ancestry of “beannachd”, step by step

Step	Language	Word	Meaning
1	Old Irish	bennacht	benediction, blessing
2	Old Irish	bendacht	blessing
3	Latin	benedictiō	blessing
4	Latin	Benedictus	Benedict
5	Latin	benedīcō	to speak well of someone, commend
6	Latin	dīcō	to say, talk, speak, utter, mention
7	Latin	-tiō	tion, -ation, -ing
8	Latin	dissertātiō	(spoken) dissertation, discourse, disquisition
9	Latin	dissertus	arranged, disposed; explained
10	Latin	disserere	second-person singular future passive indicative...
11	Latin	dis-	asunder, apart, in two; reversal, removal;...
12	Latin	calceus	shoe
13	Latin	calx	limestone; chalk; the finish line
14	Ancient Greek	χάλιξ	small stone, pebble; gravel, rubble

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