This is the 8741st most frequent Russian word.
петров
“Петров” is a common Russian surname, derived from the first name “Пётр” (Peter).
Here, 'Петров' denotes a surname typically found in Russia, used as a subject noun.
Петров — это обычная русская фамилия.
Petrov is a common Russian surname.
In this sentence, 'Петрова' is in the genitive case, indicating possession ('Petrov's').
Это была книга Петрова, лежавшая на столе.
It was Petrov's book lying on the table.
Here, 'Петрову' is in the dative case because it is the indirect object of the verb 'called'.