Where does “wesółko” come from?

wesółko (Polish) comes from Polish wesoło, from Polish Wesoły, from Old Polish wesoły, from Proto-Slavic veselъ, from Proto-Balto-Slavic weselas, from Proto-Indo-European h₁wésus, from Proto-Indo-European -us — Forms adjectives from Caland system roots.

Ancestry of “wesółko”, step by step

StepLanguageWordMeaning
1Polishwesołomerrily, cheerfully
2PolishWesołymerry
3Old Polishwesołymerry
4Proto-Slavicveselъmerry
5Proto-Balto-Slavicweselascheerful, merry, happy
6Proto-Indo-Europeanh₁wésusgood, excellent
7Proto-Indo-European-usForms adjectives from Caland system roots
Every word from Proto-Indo-European -us →Every word from Proto-Indo-European h₁wésus →Every word from Proto-Balto-Slavic weselas →