Hi Pam. Its not so much that the same monitor has many names, its more like many monitors have the same common name.
Please understand, common names are for your understanding. In Kingsnakes, people use counties, a such and such county eastern kingsnake. They do this because that local of kingsnake has qualities that are different from other areas. This is done with many reptiles.
A banded cape or banded cape whitethroat means, its an V.albigularis for the cape region of south africa(the state). Banded means its pattern is banded, Some from the same region are not banded. There are both banded and non-banded cape monitors.
Whitethoat is simple, its V.a.albigularis, They occur from Tanzania in the north to S.A. in the south. That covers many different locals and color morphs of that species. Some have whitethroats some do not.
Common names are discriptive, and do not have to be accurate. In fact, even scientific names are constantly changing. What is important is local. For an individual monitors to be important to science, its local or genetic local must be accurate. All the rest is subject to change. Good luck FR