Where does “treenisali” come from?

treenisali (Finnish) comes from Finnish sali, from Swedish säl, from Old Norse selr, from Proto-Germanic selhaz, from Proto-Indo-European selk- — to pull, drag; to drag, to furrow; to pull, draw.

Ancestry of “treenisali”, step by step

treenisali traces back through two separate lines of ancestry.

via Finnish sali

Step	Language	Word	Meaning
1	Finnish	sali	hall; A large room, often one in which dinners...
2	Swedish	säl	a seal
3	Old Norse	selr	seal; second-person singular present indicative...
4	Proto-Germanic	selhaz	seal
5	Proto-Indo-European	selk-	to pull, drag; to drag, to furrow; to pull, draw

via Finnish treeni

Step	Language	Word	Meaning
1	Finnish	treeni	training
2	Swedish	träning	training, exercise
3	Swedish	träna	to exercise, to practice; to perform activities...
4	Old Norse	trana	a crane bird

Every word from Proto-Indo-European selk- →Every word from Proto-Germanic selhaz →Every word from Old Norse selr →