This is the 283rd most frequent Polish word.
piotr
"Piotr" is the Polish equivalent of the name "Peter."
The word 'Piotr' is used as a proper noun, serving as the subject of the sentence and denoting a person's name.
Piotr gra na pianinie każdego wieczoru.
Piotr plays the piano every evening.
Here, 'Piotr' is again a proper noun, but it is in the locative case 'Piotrze,' used as part of the prepositional phrase linked to the narrative structure.
W mojej historii opowiadam o Piotrze, dzielnym rycerzu.
In my story, I talk about Piotr, the brave knight.
In this sentence, 'Piotrem' is the instrumental form of 'Piotr,' following the preposition and showcasing grammatical case changes for the noun.