Spanish supplies the name “quinceañera” for this fifteenth-birthday tradition.
The word is built from Spanish vocabulary connected with fifteen years of age. Spanish-speaking communities across Latin America and elsewhere use the term, while English often adopts it unchanged because it names a particular cultural tradition rather than an ordinary birthday party.
Portuguese-speaking countries have related coming-of-age customs, but Portuguese is not the language from which quinceañera comes. The ñ is an especially visible clue that the word is Spanish. English spellings sometimes omit the tilde, but the standard Spanish form retains it.
The tradition itself is broader than language. Families may celebrate in Spanish, English, Portuguese, or another language, particularly in immigrant communities. The name remains Spanish even when the ceremony is bilingual or held outside a Spanish-speaking country.