Where does “лишенько” come from?

лишенько (Ukrainian) comes from Ukrainian -енько, from Russian -ень, from Proto-Slavic *-ьnь.

Ancestry of “лишенько”, step by step

StepLanguageWordMeaning
1Ukrainian-енькоsuffix used to form (often colloquial)
2Russian-ень—
3Proto-Slavic*-ьnь—
Every word from Proto-Slavic *-ьnь →Every word from Russian -ень →Every word from Ukrainian -енько →