This is the 7181st most frequent Russian word.
валера
"Валера" is a male given name in Russian, short for "Валерий" (Valeriy).
Here, 'Валера' is used as a male proper noun representing a person's name.
Валера любит играть на гитаре.
Valera loves playing the guitar.
In this sentence, 'Валере' is in the dative case, which is used to denote the indirect object of the verb.
Зайди к Валере за учебником.
Go to Valera to get the textbook.
'Валеры' is used in the genitive case to indicate possession, showing that the advice belongs to Valera.