Iccobar was a language derived from the ancient Iconian language, with which it shared certain similarities, presenting the hypothesis that some Iconians were able to survive the orbital bombardment of Iconia. (TNG: "Contagion")
In the video game Star Trek Online, the Iccobar (β) were a warp-capable humanoid species that existed 200,000 years ago. They were a war-like race, coveting the Iconians' gateway technology, which the Iconians refused to share. The Iccobar led an alliance of other races in an attack on Iconia, which devastated the Iconian civilization.