The term "Malai Arayan" or "Malayarayan" are a term belongs to a tribal communityScheduled Tribe

Adivasi

Adivasi is an umbrella term for a heterogeneous set of ethnic and tribal groups claimed to be the aboriginal population of India. They comprise a substantial indigenous minority of the population of India...

 who lives in parts of Kottayam,Idukki and Pathanamthitta Districts of Kerala

Kerala

or Keralam is an Indian state located on the Malabar coast of south-west India. It was created on 1 November 1956 by the States Reorganisation Act by combining various Malayalam speaking regions....

a State of southern India.They are listed as part of Scheduled Tribes by the Govt of India considering the ethnicity.Majority of them turned their religious belief from serving their centuries old "Mala Daivangal" to Christianity ,especially to Church of South India commonly known as CSI,because of the sufferings from the exploitation of their illiteracy and cultural uniqueness by the so called "modern world" for centuries.
The centre of Malayarayan community is "Melukavu" ,a hill-located town to the east of Kottayam District of Kerala.It also houses the Cathedral Church of the East Kerala Diocese of the Church of South India.
The Convertion from Ethnic Belief to Christianity