It is the name of a genus of birds in the Tyrannidae family. They are well known as attract or nuns. The word possibly is Nahuatl in origin and means "clean clothes" or "habit, costume" (Tzoma).
Xolmis: A genus of passerine birds of the family of the tyrant-flycatchers whose species are native to Ameruca of the South and are known as nuns or attract.