Words that come from Proto-Balto-Slavic ink-

9 words across 3 languages descend from Proto-Balto-Slavic ink- — including jąkała, Jąkała, jąkać, jęczeć, Jęcek, Jęcz, ječati, ękati.

See the etymology of ink- itself →

Polish (6)

Proto-Slavic (2)

Serbo-Croatian (1)