This is the 608th most frequent Russian word.
иван
"Iван" is the Russian equivalent of the name "Ivan" (John in English).
Here, 'Иван' is used as a proper noun, referring to a person's name.
Иван пошёл в магазин за продуктами.
Ivan went to the store for groceries.
In this sentence, 'Иван' is part of a noun phrase 'Иван-чай', referring to a specific type of tea.
Иван-чай — это традиционный русский напиток.
Ivan tea is a traditional Russian beverage.
The word 'Иван' here is used in a phrase to denote a nickname or a common reference for someone.