This is the 8270th most frequent Russian word.
матвеев
"Матвеев" is a Russian surname derived from the given name Матвей (Matvey), meaning "Matthew."
Here, 'Матвеев' is used as a proper noun, likely referring to a person's surname, serving as the subject performing the action.
Матвеев вчера посетил музей искусств.
Matveyev visited the art museum yesterday.
In this sentence, 'Матвеев' identifies the author of the book, emphasizing attribution of the work or accomplishment.
Книга, которую написал Матвеев, получила премию.
The book written by Matveyev received an award.
Here, 'Матвеевым' is the instrumental form of the surname 'Матвеев', expressing the agent who prepared the report, showing instrumental case usage.