In Afrikaans we call this the "Bloukopkoggelmander" and its distribution range stretch as far down south to Zululand (where I live). I regularly have the privilege to see one of these in my garden.
There seem to be quite a bit of confusion when searching the Internet for information on this reptile though. For example, when reviewing the English common name, you might find descriptions such as:- Blueheaded Southern Tree Agama, Blue Headed Tree Agama, Southern Tree Agama, Tree Agama, Blue-throated Agama, etc. As if this does not provide enough bewilderment the genus/species names also present quite a variety of results such as:- Acanthocercus atricollis, Acanthocerus atricollis, Acanthocecerus atricollis, Acanthocercus atricollis atricollis, and an apparent older classification has it as Agama atricollis.
After all this mystification it seems like you can pretty much settle for Southern Tree Agama (Source) - Acanthocercus atricollis (Source) and just for positive visual identification you can refer to this link.
A splendid capture with perfect sharp details, amazing lighting, great DOF & BG, and excellent breeding colours presented by this lovely specimen.
Very well done and TFS.
Acanthocercus atricollis (82) *