Where does “pienikaliiberinen” come from?

pienikaliiberinen (Finnish) comes from Finnish pieni, from Proto-Finnic peeni — little, small; fine.

Ancestry of “pienikaliiberinen”, step by step

pienikaliiberinen traces back through two separate lines of ancestry.

via Finnish pieni

StepLanguageWordMeaning
1Finnishpienilittle, small; Third-person singular indicative...
2Proto-Finnicpeenilittle, small; fine

via Finnish kaliiberi

StepLanguageWordMeaning
1Finnishkaliiberi
Every word from Proto-Finnic peeni