Why are models having there parent class names in admin Django

I have created models like this

class User(AbstractUser):
    login_count = models.PositiveIntegerField(default=0)

class Supplier(User):
    company_name= models.CharField(max_length=30)
    company_domain=models.CharField(max_length=30)
    

class Worker(User):
    ACCOUNT_TYPE = (
        ('1', 'Admin'),
        ('2', 'Regular'),
    )
    account_type = models.CharField(max_length=1, choices=ACCOUNT_TYPE)

and in the users.admin.py, I have

admin.site.register(Supplier)
admin.site.register(Worker)

Why is it that I have all models names as Users in the Django Admin? instead of Workers and Suppliers?

Because AbstractUser is an abstract model it's Meta class is inherited by all subclasses, docs.

You need to provide your own Meta class for each model and pass the verbose_name and verbose_name_plural attributes to override the values set in AbstractUsers Meta class

class Supplier(User):
    company_name = models.CharField(max_length=30)
    company_domain = models.CharField(max_length=30)

    class Meta:
        verbose_name = 'supplier'
        verbose_name_plural = 'suppliers'


class Worker(User):
    ACCOUNT_TYPE = (
        ('1', 'Admin'),
        ('2', 'Regular'),
    )
    account_type = models.CharField(max_length=1, choices=ACCOUNT_TYPE)

    class Meta:
        verbose_name = 'worker'
        verbose_name_plural = 'workers'