Where does “kauppasalaisuus” come from?

kauppasalaisuus (Finnish) comes from Finnish salaisuus, from Finnish salainen, from Finnish sala, from Proto-Finno-Ugric *sala, from Proto-Uralic śala — elm.

Ancestry of “kauppasalaisuus”, step by step

kauppasalaisuus traces back through two separate lines of ancestry.

via Finnish salaisuus

Step	Language	Word	Meaning
1	Finnish	salaisuus	secret
2	Finnish	salainen	secret, clandestine; arcane
3	Finnish	sala	A secret
4	Proto-Finno-Ugric	*sala	—
5	Proto-Uralic	śala	elm

via Finnish kauppa

Step	Language	Word	Meaning
1	Finnish	kauppa	commerce, business, trade; traffic; buying and...
2	Proto-Germanic	kaupaz	purchase
3	Latin	caupo	Tradesman; Innkeeper, shopkeeper
4	Proto-Indo-European	kaup-	—

Every word from Proto-Uralic śala →Every word from Proto-Finno-Ugric *sala →Every word from Finnish sala →