Where does “kaikinpuolin” come from?

kaikinpuolin (Finnish) comes from Finnish kaikki, from Finnish -ti, from Proto-Finnic -t'ik — caritive suffix.

Ancestry of “kaikinpuolin”, step by step

kaikinpuolin traces back through two separate lines of ancestry.

via Finnish kaikki

StepLanguageWordMeaning
1Finnishkaikkieverything; everyone, everybody; all-, omni-
2Finnish-tiForms caritive adverbs; Forms adverbs of manner
3Proto-Finnic-t'ikcaritive suffix

via Finnish puoli

StepLanguageWordMeaning
1Finnishpuolihalf; when followed by a number representing an...
2Proto-Finnicpoolihalf, side; half
3Proto-Uralicpälähalf
Every word from Proto-Finnic -t'ik →Every word from Finnish -ti →Every word from Finnish kaikki →