Where does “chan” come from?

chan (Scottish Gaelic) comes from Middle Irish nocon, from Old Irish nícon, from Old Irish ní, from Proto-Celtic nīs, from Proto-Indo-European ne h₁ésti — is not.

chan (Scottish Gaelic): not

Definitions

Ancestry of “chan”, step by step

Step	Language	Word	Meaning
1	Middle Irish	nocon	—
2	Old Irish	nícon	not
3	Old Irish	ní	not; is not, isn’t; something, anything
4	Proto-Celtic	nīs	—
5	Proto-Indo-European	ne h₁ésti	is not

Every word from Proto-Indo-European ne h₁ésti →Every word from Proto-Celtic nīs →Every word from Old Irish ní →