This is the 1042nd most frequent Polish word.
zełenski
"Zełenski" is a Polish transliteration of the surname "Zelensky," typically referring to Ukrainian President Volodymyr Zelensky. It is not a standalone word.
Here, "Zełenskim" is the instrumental case of "Zełenski," used after the preposition "z" to indicate accompaniment.
Prezydent Andrzej Duda spotkał się z Wołodymyrem Zełenskim, aby omówić sytuację na Ukrainie.
President Andrzej Duda met with Volodymyr Zelenskyy to discuss the situation in Ukraine.
In this sentence, "Zełenskiego" is the genitive case of "Zełenski," used to indicate possession or relation.
W książce opisano życie Wołodymyra Zełenskiego przed jego prezydenturą.
The book describes the life of Volodymyr Zelenskyy before his presidency.
Here, "Zełenski" is in its nominative case, used as the subject of the sentence.