Yumnam is a surname of the Meitei community in Manipur. There are localities like Yumnam Leikai, named after this surname. This family tree belongs to the warriors of Kangleipak. A kingdom from the period of B.C. The places that we know of with this name so far in Manipur (India) are Yumnam Khunou, Singajamei Yumnam Leikai, Thangmeiband Yumnam Leikai.
Consider to be the strongest warrior of the kingdom of Kangleipak. The Japanese invasion during the second world war gives a mixed bloodline with Japanese.
References
Yumnam Wikipedia(Text) CC BY-SA