Hun/ Vucub Came
Hun Came and Vucub Came (One Death and Seven Death) are the principle death gods of the Mayan underworld.
Iblis
In the Qur'an, the Devil has 2 names. Iblis, probably derived from the Greek diabolos and used always in the singular and as a personal name.
Ipos
Ipos/Ipes/ Ayperos is a prince and count of hell, who commands 36 legions. He appears as an angel or lion with the head and feet of a goose and a short hair's tail.
Izanami
Izanagi and Izanami were the two young gods chosen to bring order to the world of chaos in Japanese mythology.
Jormungand
The serpent, Jormungand was the middle child of Loki and the giantess, Angrboda.