Umunze is the headquarters of Orumba south local government area in Anambra state of Nigeria. Its geographic coordinates are 5° 58′ 0″ north, 7° 13′ 0″ east.
The name Umunze was derived from the name of the originator "Nze" meaning the descendant of nze in about 1476 during the time of extreme drought. Nze Izo Ezema was a farmer and hunter from ohafia near Arochukwu in the present day Abia State. He wandered the forest of his normal hunting and discoveries when he came across a very fertile land full of arable crops and he liked it. He settled and was very comfortable considering the weather and other climatic factors. He went back to his father and told him about his new home and also ask for wives. His father saw his behaviour and equipped him with necessities. He was given a mother shrine that has a stream known as Izo mmiri (the present Izo in the eke izo square) with two wives and a slave to the Izo. He settled first at Akpu Mgbatiri Okpa situated at Umuizo today. His wives Mrs Lolo and Ijendu. Lolo gave birth to 7 sons and 1 daughter and ijendu had 1 son. Izo was Nze's father's name in Ohahia : Ezema was the family village name in Ohafia.