This is the 7743rd most frequent Russian word.
иваном
The Russian word "иваном" is the instrumental case of "Иван" (Ivan), meaning "by Ivan" or "with Ivan."
Here, 'Иваном' is the instrumental case of the proper noun 'Иван', used to indicate an action performed with someone.
Я пошёл на встречу с Иваном.
I went to a meeting with Ivan.
In this sentence, 'Иваном' represents the instrumental case to show association or relationship with Ivan.
Моя дружба с Иваном длится уже десять лет.
My friendship with Ivan has lasted for ten years.
The word 'Иваном' here is again in the instrumental case, used to indicate the person about whom a feeling is expressed.