This is the 952nd most frequent Finnish word.
ari
"Arı" is not a Finnish word but a Turkish one meaning "bee." In Finnish, "Ari" is typically a male given name.
In this sentence, 'Ari' is used as a proper noun referring to a person's name.
Ari on hyvä ystäväni.
Ari is my good friend.
'Ari' is again a proper noun, used in this context as the indirect object, denoting to whom the action is directed.
Kerroitko jo Arille uudesta suunnitelmasta?
Did you already tell Ari about the new plan?
Once more, 'Ari' functions as a proper noun, representing the subject performing the action in the sentence.