Wikipedia
Muniandi
Muniandi is a regional Tamil guardian deity. The deity Muniandi refers to the Munis worshipped by the Tamil people. Muni refers to a class of guardian deities which are classified as Siva Gana. They are servants of the Supreme God Siva and his female half Sakthi. The Munis could refer to former warriors, kings or sages who achieved the status of a Muni after their human death. Some of the Munis worshipped were created as Munis and did not go through the human life cycle.
The Munis are worshipped as Guardian Deity (Kaval Deivam), Favourite Deity (Ishta Deivam) and Family Deity (Kula Deivam). Muniandi is also known as Muniappan, Aandiappan and Munisamy.