This is the 2748th most frequent Russian word.
илья
"Iлья" is a Russian male given name, equivalent to "Elijah" in English.
In this sentence, 'Илья' is a proper noun used as a person's name, common in Russian-speaking contexts.
Илья решил пойти на прогулку.
Ilya decided to go for a walk.
Here, 'Илья' is again a personal name, serving as the subject of the sentence to indicate who performed the action.
Позвонил Илья и сказал, что будет поздно.
Ilya called and said he would be late.
In this example, 'илья' is a poetic or archaic form, synonymous with 'или,' meaning 'or' in English, used rarely but present in literary texts.