The young male attendants in many quinceañera traditions are called chambelanes.
A chambelán is traditionally part of the celebrant’s court, a group that may accompany her during the formal entrance, religious service, photographs, and choreographed dances. The plural form is chambelanes. In English-language celebrations, these attendants may also be described as escorts or members of the court of honor.
The court is not identical in every community. Some quinceañeras have both male and female attendants, while others choose a smaller group, a mixed-gender court, or no court at all. The celebrant’s friends or relatives commonly fill these roles.
Padrinos are different: that word generally refers to sponsors or family friends who help support the celebration. Mariachi musicians are performers, not attendants. These terms are sometimes mixed up because all may appear at the same event.