This is the 6909th most frequent Russian word.
алвес
It seems "алвес" is not a standard Russian word. It might be a typo, a proper noun, or borrowed slang.
In this sentence, "Алвес" is a proper noun, likely a person's name.
Алвес часто посещает нашу библиотеку.
Alves often visits our library.
Here, "Алвес" is part of a title or brand name, specifically referring to a type of wine.
Мой друг заказал редкое вино «Алвес Альба».
My friend ordered a rare wine called "Alves Alba".
In this context, "Алвеса" is the genitive case of a proper noun, indicating possession or authorship.