Where does “kaksihammasvalas” come from?

kaksihammasvalas (Finnish) comes from Finnish hammas, from Proto-Finnic hambas, from Proto-Balto-Slavic źámbas, from Proto-Indo-European ǵómbʰos, from Proto-Indo-European ǵómbʰ- — to pierce, gnaw through; tooth, horn, peg.

Ancestry of “kaksihammasvalas”, step by step

kaksihammasvalas traces back through 3 separate lines of ancestry.

via Finnish hammas

StepLanguageWordMeaning
1Finnishhammastooth
2Proto-Finnichambastooth
3Proto-Balto-Slavicźámbastooth; sharp or jagged edge
4Proto-Indo-Europeanǵómbʰostooth; row of teeth; peg
5Proto-Indo-Europeanǵómbʰ-to pierce, gnaw through; tooth, horn, peg

via Finnish valas

StepLanguageWordMeaning
1Finnishvalaswhale
2Proto-Samicfālēswhale
3Proto-Germanichwalazwhale, sheatfish
4Proto-Indo-European(s)kʷáloslarge fish; sheatfish

via Finnish kaksi

StepLanguageWordMeaning
1Finnishkaksitwo
2Proto-Finnickakcitwo
3Proto-Uralic*kakta—
Every word from Proto-Indo-European ǵómbʰ- →Every word from Proto-Indo-European ǵómbʰos →Every word from Proto-Balto-Slavic źámbas →