Òǹkò name /ò.ŋ̀.kò/
Definitions
  1. A Yoruba subethnic group in Oyo State, Nigeria. Òǹkò towns include Ṣakí, Ìsẹ́yìn, Ṣẹ̀pẹ̀tẹ̀rí, Kìṣí, and Ìgànná.
  2. A Yoruba dialect spoken by the Òǹkò people.
Source: Wiktionary, where this word is spelled “Onko”. Reference: en-Onko-yo-name-QB-LJXSb