This is the 9755th most frequent Russian word.
эйса
The Russian word "эйса" refers to a traditional Okinawan dance performed with drums.
Here, 'эйса' is used as a proper noun referring to a person named Eysa.
Эйса быстро подошёл к двери и постучал.
Eysa quickly approached the door and knocked.
In this sentence, 'эйса' again acts as a proper noun, indicating the same individual, Eysa.
Мы видели эйсу в магазине вчера.
We saw Eysa in the store yesterday.
Here, 'эйса' denotes a proper noun, and its role is to label an individual highlighted for their achievement.