Igboid languages constitute a branch of the
Volta–Niger language family. It includes Ekpeye, Ukwuani, and the Igbo languages:
Williamson and
Blench conclude that the Igbo languages (Igboid apart from Ekpeye) form a "language cluster" and that they are somewhat
mutually intelligible. However, mutual intelligibility is only marginal, even among the Izii–Ikwo–Ezaa–Mgbo languages.