Where does “Kowtun” come from?

Kowtun (English) comes from Ukrainian Ковтун, from Russian -у́н, from Proto-Slavic *-unъ — er.

Ancestry of “Kowtun”, step by step

StepLanguageWordMeaning
1UkrainianКовтунmatted hair or wool
2Russian-у́н—
3Proto-Slavic*-unъer
Every word from Proto-Slavic *-unъ →Every word from Russian -у́н →Every word from Ukrainian Ковтун →