Words that come from Old Irish in-

27 words across 5 languages descend from Old Irish in- — including in-, yn-, tinól, tionól, comhthionól, bean-teagaisg, teagaisg, teagasg.

See the etymology of in- itself →

Old Irish (16)

Irish (4)

Scottish Gaelic (4)

Middle Irish (2)

Manx (1)