Where does “uuvahtaminen” come from?

uuvahtaminen (Finnish) comes from Finnish uuvahtaa, from Finnish uupua, from Finnish uu, from Latin U, from Latin V, from Etruscan ? — u.

Ancestry of “uuvahtaminen”, step by step

StepLanguageWordMeaning
1Finnishuuvahtaato (suddenly) get tired
2Finnishuupuato get tired, get exhausted, get fatigued; to be...
3FinnishuuThe name of the Latin-script letter U; hole, nest
4LatinU—
5LatinVve
6Etruscan?u
Every word from Etruscan ? →Every word from Latin V →Every word from Latin U →