This is the 202nd most frequent Bulgarian word.
юни
"Юни" in Bulgarian means "June" in English.
In this sentence, 'Юни' is a person's name, demonstrating its use as a proper noun.
На Юни подарих книга за рождения му ден.
I gave Juni a book for his birthday.
'юни' is used to indicate a specific time period (the month of June) to situate the event.
Ще посетим плажа през юни, когато децата са във ваканция.
We will visit the beach in June when the children are on vacation.
Here, 'юни' is used as the name of the calendar month to refer to its characteristics.