Where does “coiteanta” come from?

coiteanta (Irish) comes from Irish coiteann, from Middle Irish coitchenn, from Proto-Celtic kom-teges-nos.

Ancestry of “coiteanta”, step by step

Step	Language	Word	Meaning
1	Irish	coiteann	common; demotic; popular
2	Middle Irish	coitchenn	—
3	Proto-Celtic	kom-teges-nos	—

coiteanta — Etymology, Origin & Word History | Etymology Explorer