This is the 221st most frequent Serbian word.
никола
"Никола" is a Serbian proper noun, equivalent to the male given name "Nikola" in English.
Here, 'Николом' is in the instrumental case, used to denote 'with Nikola.'
Разговарао сам са Николом о плановима за викенд.
I talked to Nikola about the plans for the weekend.
In this sentence, 'Николу' is the accusative form of the name Nikola, indicating the direct object of the action.
Звао сам Николу да дође на вечеру.
I called Nikola to come to dinner.
Here, the word 'никола' is used as a proper noun, representing a person's name.