Where does “arvauttaa” come from?

arvauttaa (Finnish) comes from Finnish -uttaa, from Ingrian -ua, from Finnish -ttää, from Proto-Finnic -ttadak, from Proto-Uralic -kta-.

Ancestry of “arvauttaa”, step by step

Step	Language	Word	Meaning
1	Finnish	-uttaa	aivastaa + API → aivastuttaa; rakentaa + API →...
2	Ingrian	-ua	Used to form inchoative verbs
3	Finnish	-ttää	Front vowel variant of -ttaa
4	Proto-Finnic	-ttadak	Creates causative verbs from regular verbs,...
5	Proto-Uralic	-kta-	—