Where does “Aleksi” come from?

Aleksi (Finnish) comes from Russian Алексе́й, from Russian Алекси́й, from Ancient Greek Ἀλέξιος, from Ancient Greek -ῐος, from Proto-Indo-European -yós — Creates adjectives from noun or verb stems.

Ancestry of “Aleksi”, step by step

Aleksi traces back through two separate lines of ancestry.

via Russian Алексе́й

Step	Language	Word	Meaning
1	Russian	Алексе́й	Alpha (A in the ICAO spelling alphabet)
2	Russian	Алекси́й	—
3	Ancient Greek	Ἀλέξιος	helper, defender
4	Ancient Greek	-ῐος	belonging to; of”, “belonging to”, “pertaining to
5	Proto-Indo-European	-yós	Creates adjectives from noun or verb stems

via Latin Alexius

Step	Language	Word	Meaning
1	Latin	Alexius	—
2	Ancient Greek	Ἄλεξις	helper, defender
3	Ancient Greek	ᾰ̓λέξω	I ward off; ward off
4	Proto-Indo-European	h₂lek-s-	—

Words derived from “Aleksi”

Aleksis

Every word from Proto-Indo-European -yós →Every word from Ancient Greek -ῐος →Every word from Ancient Greek Ἀλέξιος →