Perhaps you’re thinking of “cogn” — which is actually originally two parts – co + gno(scere), “to know”, as in:

incognito

precognitive

recognizance

recognize

Cocagne, New Brunswick – a town in Canada named after Cockaigne

Praying mantis, known as Cagn, – the Khoi-San (bushmen) of Southern Africa hailed the praying mantis as Cagn -the progenitor of their race. In rock art they depicted Cagn with mantis head and arms, human body and legs.

http://www.travelafricamag.com/content/view/714/72/

Here’s an acronym: “CAG,N” …. the Competition Advocate General of the Navy …(as in the United States Navy)

And now if you want something technical….

Protein CagN: The Helicobacter pylori cag Pathogenicity Island Protein CagN is a bacterial membrane-associated protein that is processed at its C Terminus …. Helicobacter pylori infects nearly half the world’s population and is associated with a spectrum of gastric maladies. http://beta.uniprot.org/citations/16622188