A boy celebrating the male form of a traditional fifteenth-birthday event is called a quinceañero.
The term is the masculine counterpart to quinceañera, the Spanish word commonly used for a girl celebrating the milestone. Both words derive from quince, meaning fifteen, and relate to the person reaching this symbolic age rather than to the party itself.
Quinceañera celebrations are most strongly associated with girls, but comparable celebrations for boys exist in some families and communities. Their customs are not standardized: a boy’s event may borrow formal attire, family rituals, a court, music, or a religious service from quinceañera traditions, or it may use a different format entirely.
The accent mark and ñ are part of standard Spanish spelling. In English-language writing, the feminine term is often used broadly for the celebration, even when discussing related male observances.