From *yum(u)ru, From Proto-Turkic *yum. Cognate to Kyrgyz жумуру (jumuru), Kazakh жұмыр (jūmyr), Bashkir йомро (yomro), Turkish yumru, Turkmen ýumry, etc.
јумур • (ǰumur)
* Корневой чувашско-русский словарь, Казань, 1875, pages 105