A young man traditionally serving in a quinceañera court is called a chambelán in Spanish.
Chambelanes are male attendants in the corte de honor, the court accompanying the quinceañera. They commonly participate in the entrance and in rehearsed dances, often wearing coordinated suits or formal outfits. The word is associated with the ceremonial role, not with being the celebrant's romantic partner.
A court may include several chambelanes alongside damas, the traditionally female attendants. The number is not fixed, and many modern celebrations use a smaller group, a mixed group, or no formal court. Families adapt the arrangement to their community, budget, preferences, and relationships.
Chambelán should also be distinguished from padrino. A padrino is a sponsor or godparent-like supporter, while a chambelán is an attendant who participates in the public celebration. Spanish usage can vary by region, but the court-related meaning is the relevant traditional one here.