Where does “vakuuttelu” come from?

vakuuttelu (Finnish) comes from Finnish vakuutella, from Finnish vakuuttaa, from Finnish uuttaa, from Finnish uu, from Latin U, from Latin V, from Etruscan ? — u.

vakuuttelu (Finnish): reassuring, reassurance trying to dispel someone of their doubt

Definitions

reassuring, reassurance trying to dispel someone of their doubt

Ancestry of “vakuuttelu”, step by step

Step	Language	Word	Meaning
1	Finnish	vakuutella	To reassure
2	Finnish	vakuuttaa	to assert, assure, convince; to reassure; to...
3	Finnish	uuttaa	to extract; Third-person singular indicative...
4	Finnish	uu	The name of the Latin-script letter U; hole, nest
5	Latin	U	—
6	Latin	V	ve
7	Etruscan	?	u

Every word from Etruscan ? →Every word from Latin V →Every word from Latin U →