Where does “undertecknare” come from?

undertecknare (Swedish) comes from Swedish underteckna, from Swedish under, from Old Swedish under, from Old Norse undr, from Proto-Germanic wundrą, from Proto-Indo-European wenh₁- — to love.

Ancestry of “undertecknare”, step by step

Step	Language	Word	Meaning
1	Swedish	underteckna	to undersign, to underwrite
2	Swedish	under	under; below; beneath; during, at the same time...
3	Old Swedish	under	wonder, miracle; wonderment, awe, marvel
4	Old Norse	undr	wonder; scandal
5	Proto-Germanic	wundrą	wonder, miracle
6	Proto-Indo-European	wenh₁-	to love

Every word from Proto-Indo-European wenh₁- →Every word from Proto-Germanic wundrą →Every word from Old Norse undr →