The following is a list of unnamed Efrosians.
Communications officer, USS Hypatia
In 2377, a middle-aged Efrosian was the engineer of the Otamawan. He was inspecting the ship's hull when he saw Grauq, who killed the Efrosian before he could challenge the Chalnoth or warn his fellow crewmembers. (DS9 novel: Warpath)
In 2369, the Efrosian government secretary communicated to a Starfleet admiral the Federation President's desire to allow Gul Trelar to come to Deep Space 9 to die. The admiral believed the decision was not wise, although the Efrosian reminded her the President thought it was. (DS9 comic: "Old Wounds")