A male celebrant of a quinceañera-style 15th-birthday celebration is commonly called a quinceañero.
The term is the masculine counterpart of quinceañera. Spanish uses grammatical gender in many nouns and adjectives, so quinceañero and quinceañera distinguish the male and female forms. In English, quinceañera remains the much more widely recognized name for the tradition overall.
A quinceañero celebration may borrow familiar elements from quinceañeras, including formal clothing, a reception, attendants, music, and family speeches. The exact format is not universal: some families use a different name, emphasize a cultural rather than religious program, or create a modern party without traditional rituals.
Chambelán is not a synonym for the celebrant. It usually identifies a male escort or member of the court of honor. Likewise, a dama is generally a female attendant. These roles can appear at the same event but describe different people.