Where does “blankovaltakirja” come from?

blankovaltakirja (Finnish) comes from Finnish blanko, from German blanko, from Italian bianco, from Latin blancus, from Frankish blank, from Proto-Germanic *blank, from Proto-Germanic blankaz, from Proto-Indo-European bhleg- — to shine, white; to shine, burn, scorch.

Ancestry of “blankovaltakirja”, step by step

blankovaltakirja traces back through two separate lines of ancestry.

via Finnish blanko

StepLanguageWordMeaning
1Finnishblankoblank used only as modifier in compound terms
2Germanblankounprinted, unlined of paper
3Italianbiancowhite; blank; linen
4Latinblancuswhite
5Frankishblankbright; gleaming, white, blinding; bright,...
6Proto-Germanic*blank
7Proto-Germanicblankazbright, shining, white, gleaming, blinding
8Proto-Indo-Europeanbhleg-to shine, white; to shine, burn, scorch

via Finnish valtakirja

StepLanguageWordMeaning
1Finnishvaltakirjapower of attorney, letter of attorney
2Finnishvaltapower, authority, rule; main, principal; country,...
3Proto-Finnicvaltamight, power, authority; white
4Proto-Germanicwaldąmight, power, authority
5Proto-Indo-Europeanwaldʰ-to be strong, be powerful, prevail, possess
Every word from Proto-Indo-European bhleg-Every word from Proto-Germanic blankazEvery word from Proto-Germanic *blank