So I came up with what the consortium of non-human races that have positive relations with the Epsilon Alliance call themselves: The A’duuin. It fit better than something like “the League” or anything like that (the League just makes me think of the League of non-aligned worlds from Babylon 5). Colloquially, humans of the Alliance simply term their non-human trade partners and sometime allies as “the Races.” But these people wouldn’t call themselves that. Hence, A’duuin.
official website of Erin M. Klitzke, historian and author of Awakenings and Epsilon: Broken Stars