Where does “Марко” come from?

Марко (Ukrainian) comes from Old Church Slavonic Маркъ, from Koine Greek Μᾶρκος, from Latin Marcus, from Latin Mars, from Latin Mavors, from Proto-Italic Māwortis.

Ancestry of “Марко”, step by step

Step	Language	Word	Meaning
1	Old Church Slavonic	Маркъ	—
2	Koine Greek	Μᾶρκος	—
3	Latin	Marcus	—
4	Latin	Mars	war, battle, conflict
5	Latin	Mavors	—
6	Proto-Italic	Māwortis	—

Every word from Proto-Italic Māwortis →

Марко — Etymology, Origin & Word History | Etymology Explorer