Where does “Sergejs” come from?

Sergejs (Latvian) comes from Russian Серге́й, from Ancient Greek Σέργιος, from Latin Sergius.

Ancestry of “Sergejs”, step by step

Step	Language	Word	Meaning
1	Russian	Серге́й	Sergius
2	Ancient Greek	Σέργιος	—
3	Latin	Sergius	—

Sergejs — Etymology, Origin & Word History | Etymology Explorer