Power cable with ground (whats this called?)
 

Does anyone know what this cable would be called to search for on like Amazon or online to buy one?

Its got a power connector, like a circular female style and has two cables off of that, black one that ends in a grounding metal plate and a red one that is just a cable that ends.

I've tried various searches but since I don't know what these things are called I've yielded no results. Its a cable for some interior lighting that uses this cable plus a "ad a fuse" so you don't need to power the lights by a cigarette lighter.

Any help would be appreciated!

That's a barrel connector.

amazon search "Security Camera Red Black DC Power adapter plug Pigtail"

Barrel connector or Coaxial power connector

Crimp/solder the ends you want to the pigtail