Where does “ghníonn” come from?

ghníonn (Irish) comes from Irish ann, from Old Irish and, from Proto-Celtic andom, from Proto-Indo-European h₁n̥dó, from Proto-Indo-European h₁én — in.

Ancestry of “ghníonn”, step by step

ghníonn traces back through two separate lines of ancestry.

via Irish ann

Step	Language	Word	Meaning
1	Irish	ann	there; third-person singular masculine of i: in...
2	Old Irish	and	third-person singular masculine/neuter dative of...
3	Proto-Celtic	andom	there
4	Proto-Indo-European	h₁n̥dó	into, inside
5	Proto-Indo-European	h₁én	in

via Irish ghní

Step	Language	Word	Meaning
1	Irish	ghní	—
2	Old Irish	do·gní	—

Every word from Proto-Indo-European h₁én →Every word from Proto-Indo-European h₁n̥dó →Every word from Proto-Celtic andom →