This is the 508th most frequent Serbian word.
марко
"Марко" is a Serbian male given name, equivalent to "Mark" in English.
In this sentence, 'Марко' is used as a proper noun, referring to a person's name.
Марко воли да чита књиге.
Marko loves to read books.
Here, 'Марко' is part of a title, possibly indicating a character or subject of the play.
Гледао сам представу под називом 'Марко на коњу'.
I watched a play called 'Marko on a horse'.
In this example, 'Марко' refers to a historical figure, indicating its use to denote specific famous individuals.