There are probably four lights.
The key light is to camera right. It is in front of the subject. The reflection is visible as catch lights in the subject’s eyes.
There is a fill light to camera left to reduce shadows on the subject’s face. It is also toward the front of the subject. It could be a reflector bouncing the key light, but for a studio setting, a dedicated light is probably more likely.
The third light is behind the subject at camera left. It produces specular highlights on the subject’s hair. The hair light may also be referred to as a scratch or rim light in other contexts.
Finally there is a background light behind the subject on the camera lens axis. It creates the bright spot behind the subject’s body. It separates the dark outfit from the background while the darker area outside its beam separates the lighter colors of the subject’s head.
The setup is a standard four light configuration.