Where does “pikkukirjain” come from?

pikkukirjain (Finnish) comes from Finnish kirjain, from Finnish kirjata, from Finnish kirja, from Proto-Finnic kirja — decoration, carving, pattern.

Ancestry of “pikkukirjain”, step by step

pikkukirjain traces back through two separate lines of ancestry.

via Finnish kirjain

StepLanguageWordMeaning
1Finnishkirjainletter; Genitive plural form of kirja
2Finnishkirjatato book, log, register; to register
3Finnishkirjabook; quire
4Proto-Finnickirjadecoration, carving, pattern

via Finnish pikku

StepLanguageWordMeaning
1Finnishpikkulittle, small; little old
2Finnishpienilittle, small; Third-person singular indicative...
3Proto-Finnicpeenilittle, small; fine
Every word from Proto-Finnic kirja
pikkukirjain — Etymology, Origin & Word History | Etymology Explorer