1610s, from Latin sonorus "resounding," from sonor "sound, noise," from sonare "to sound, make a noise" (from PIE root *swen- "to sound"). Related: Sonorously; sonorousness. Earlier was sonouse (c. 1500), from Medieval Latin sonosus; sonourse "having a pleasing voice" (c. 1400), from sonor + -y (2).
<a href="https://www.etymonline.com/word/sonority">Etymology of sonority by etymonline</a>
Harper, D. (n.d.). Etymology of sonority. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/sonority