Where does “hoikkavaivaishiiri” come from?

hoikkavaivaishiiri (Finnish) comes from Finnish vaivaishiiri, from Finnish vaivainen, from Finnish vaiva, from Proto-Finnic vaiva, from Proto-Germanic waiwô, from Proto-Indo-European wai — oh!; woe!.

Ancestry of “hoikkavaivaishiiri”, step by step

hoikkavaivaishiiri traces back through two separate lines of ancestry.

via Finnish vaivaishiiri

StepLanguageWordMeaning
1Finnishvaivaishiiriharvest mouse
2Finnishvaivainenmeasly, paltry, miserable, wretched, pitiful,...
3Finnishvaivabother, inconvenience; ailment
4Proto-Finnicvaivabother, inconvenience; pain, illness, torment
5Proto-Germanicwaiwôwoe, grief, misery; evil, wickedness, malice
6Proto-Indo-Europeanwaioh!; woe!

via Finnish hoikka

StepLanguageWordMeaning
1Finnishhoikkaslim; lean
2Proto-Finnichoikkaslim, thin, slender
Every word from Proto-Indo-European waiEvery word from Proto-Germanic waiwôEvery word from Proto-Finnic vaiva