Compare with Olukumi uhọn, Ifè ɛ̀sɔ̃, Ikale Yoruba ùhọngbẹ́, Ijebu Yoruba ùsu, Ondo Yoruba ùsọn, Itsekiri esugbẹ, see Proto-Yoruba *V̀-sʊ̃, *ʊ̀-sʊ̃, *ɛ̀-sʊ̃, perhaps ultimately from Proto-Edekiri *V̀-su. See potential cognates outside of Yoruboid, Ukaan ɛ̀-ʃú, Nupe etsú. Also possibly from ụ̀- (“nominalizing prefix”) + sụn (“to cry”), literally “that which cries”, which may refer to the loud crying that it produces