Where does “Тальне” come from?

Тальне (Ukrainian) comes from Ukrainian -е, from Proto-Slavic -ę, from Proto-Indo-European -ę.

Ancestry of “Тальне”, step by step

StepLanguageWordMeaning
1Ukrainian-еSuffix added to adjectives to produce adverbs; used in place of
2Proto-Slavic-ęForms nouns for young animals and other...
3Proto-Indo-European-ę—
Every word from Proto-Indo-European -ę →Every word from Proto-Slavic -ę →Every word from Ukrainian -е →