Where does “dúinne” come from?

dúinne (Irish) comes from Irish dúinn, from Old Irish dúnn, from Old Irish sinni, from Old Irish sisni, from Old Irish snisni, from Proto-Celtic snisni, from Proto-Celtic snīs, from Proto-Indo-European nō̆s — we.

dúinne (Irish): first-person plural emphatic of do

Definitions

first-person plural emphatic of do

Ancestry of “dúinne”, step by step

Step	Language	Word	Meaning
1	Irish	dúinn	first-person plural of do: to/for us
2	Old Irish	dúnn	first-person plural of do: to us
3	Old Irish	sinni	we
4	Old Irish	sisni	we, us
5	Old Irish	snisni	we
6	Proto-Celtic	snisni	—
7	Proto-Celtic	snīs	we
8	Proto-Indo-European	nō̆s	we

Every word from Proto-Indo-European nō̆s →Every word from Proto-Celtic snīs →Every word from Proto-Celtic snisni →