This is the 109th most frequent Serbian word.
александар
"Александар" is the Serbian form of the name "Alexander."
Here, 'Александар' is used as a proper noun, serving as the name of a person who is the subject of the sentence.
Александар је мој пријатељ.
Alexander is my friend.
In this sentence, 'Александар' is in its accusative form 'Александра', which is used as the direct object who receives the action of the verb.
Зваћу Александра да пита за решење.
I will call Alexander to ask for the solution.
Here, 'Александар' is used in its nominative form to describe the subject related to the additional detail provided.