kenkäplankki (Finnish) comes from Finnish plankki, from Swedish blank, from Middle Low German blank, from Old Saxon blank, from Proto-Germanic *blank, from Proto-Germanic blankaz, from Proto-Indo-European bhleg- — to shine, white; to shine, burn, scorch.
Ancestry of “kenkäplankki”, step by step
kenkäplankki traces back through two separate lines of ancestry.