Vanniyan people claim to be descendants of medieval kings who ruled Andhra Pradesh and north Tamil Nadu. Today they have been named a scheduled backward caste in order to gain more government benefits.
There are a number of Vanniyan subgroups including the Kamakshiamma. They live in northern Tamil Nadu.

Agriculture is their main work. Some have a college education and work in business, trade and industry. The Kamakshiamma Vanniyan prefer cross-cousin marriages. They allow for divorce and remarriage. On the death of the father, sons inherit the property with the oldest son taking charge of the family estate. They have birth and marriage rituals. They cremate their dead. Caste associations look after the needs of the Kamakshiamma Vanniyan people.

The Kamakshiamma Vanniyan people practice Hinduism, the ancient religion of India. Hinduism is a catch-all phrase for the local religions of South Asia, so it is very diverse. At the popular level, Hindus worship and serve the gods of the Hindu pantheon. They visit Hindu temples and offer prayers, food, flowers, and incense to their gods in hopes of gaining protection and benefits. They do not have a personal or familial relationship with their gods like Christians or Jews. There are other Hindus who are much more philosophical, especially among the Brahmins.
Almost all Hindus participate in yearly celebrations like Holi, the festival of colors and the start of spring / Diwali, the festival of lights / Navratri, the celebration of autumn / and Rama Navami, Rama's birthday.

The Kamakshiamma Vanniyan need good schools for their children. Rural Vanniyan need help in gaining access to modern medicine, electricity and indoor plumbing. Most of all, the Kamakshiamma Vanniyan need to hear and understand the message of Jesus Christ who alone can forgive their sins and give them lasting peace of mind.

Pray for the Holy Spirit to work powerfully through believers ministering to the Vanniyan peoples.
Pray for Kamakshiamma Vanniyan families and communities to discover and embrace the free gift of life found by trusting Christ and His finished work.
Pray that growing, Bible-believing fellowships would be planted among the Kamakshiamma Vanniyan.
Pray for spiritual hunger and discernment that will lead them to the cross and the empty grave.

Scripture Prayers for the Vanniyan Kamakshiamma in India.

Singh, K. S., ed. "India's Communities A-Z", Oxford University Press, USA 1999
https://en.wikipedia.org/wiki/Vanniyar