ẹfọ̀n noun /ɛ̄.fɔ̃̀/
Definitions
  1. buffalo
Etymology
Proposed to derive from Proto-Yoruboid *ɛ́-fã̀, cognate with Igala ẹ́fà, Olukumi ẹfàn, and Edo ẹhan, equivalent to *ɛ́- (“nominalizing prefix”) + *fã̀. Perhaps it is related to Igbo efi (“cow”)
Source: Wiktionary · etymology 1, where this word is spelled “ẹfọn”. Reference: en-ẹfọn-yo-noun-GYvsr5xF