This is the 8186th most frequent Russian word.
люберцев
"Люберцев" is not a standalone word in Russian; it likely refers to "Люберцы," a town near Moscow, implying something or someone from Lyubertsy.
In this sentence, 'Люберцев' is used in the genitive plural form of 'Люберцы', referring to the town of Lyubertsy.
Мой друг из Люберцев, и он часто рассказывает об этом городе.
My friend is from Lyubertsy, and he often talks about this town.
Here, 'Люберцев' is in the genitive plural, denoting the residents of the town called Lyubertsy.
Жители Люберцев устроили мероприятие в честь праздника.
The residents of Lyubertsy organized an event in honor of the holiday.
In this context, 'Люберцев' represents the town Lyubertsy, again using the genitive plural.