This is the 661st most frequent Estonian word.
kellele
"To whom" or "for whom."
Here, 'kellele' is used as a relative pronoun within an indirect question to refer to the owner of the object.
Ma ei tea, kellele see kuulub.
I don't know to whom this belongs.
In this sentence, 'kellele' is used as an interrogative pronoun to ask about the recipient of the gift, indicating a relationship or direction of an action towards someone.
Kellele sa selle kingituse andsid?
To whom did you give this gift?
In this usage, 'kellele' introduces a question about an appropriate contact person for assistance.