Where does “Tero” come from?

Tero (Finnish) comes from Finnish Antero, from Finnish Andreas, from Ancient Greek Ἀνδρέας, from Ancient Greek ἀνήρ, from Proto-Hellenic *anḗr — man.

Ancestry of “Tero”, step by step

Tero traces back through two separate lines of ancestry.

via Finnish Antero

StepLanguageWordMeaning
1FinnishAntero—
2FinnishAndreasAndrew the Apostle
3Ancient GreekἈνδρέας—
4Ancient Greekἀνήρman; husband; human being, as opposed to a god
5Proto-Hellenic*anḗrman

via Russian Терентий

StepLanguageWordMeaning
1RussianТерентий—
Every word from Proto-Hellenic *anḗr →Every word from Ancient Greek ἀνήρ →Every word from Ancient Greek Ἀνδρέας →