Where does “со́ло” come from?

со́ло (Russian) comes from Italian solo, from Latin sōlus, from Ancient Greek Σολοῦς.

Ancestry of “со́ло”, step by step

Step	Language	Word	Meaning
1	Italian	solo	alone, by oneself, unattended, unaccompanied,...
2	Latin	sōlus	—
3	Ancient Greek	Σολοῦς	—

со́ло — Etymology, Origin & Word History | Etymology Explorer