Where does “sivallella” come from?

sivallella (Finnish) comes from Finnish sivaltaa, from Finnish sipa-.

Ancestry of “sivallella”, step by step

Step	Language	Word	Meaning
1	Finnish	sivaltaa	to slash, strike, lash, slap to deliver a fast and powerful swinging blow, usually with something longish and/or flexible such as a hand, sword, whip or rod
2	Finnish	sipa-	—