Thulukkar are the Muslim

Muslim

A Muslim, also spelled Moslem, is an adherent of Islam, a monotheistic, Abrahamic religion based on the Quran, which Muslims consider the verbatim word of God as revealed to prophet Muhammad. "Muslim" is the Arabic term for "submitter" .Muslims believe that God is one and incomparable...

 population in south and central 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....

 who speak Tamil

Tamil language

Tamil is a Dravidian language spoken predominantly by Tamil people of the Indian subcontinent. It has official status in the Indian state of Tamil Nadu and in the Indian union territory of Pondicherry. Tamil is also an official language of Sri Lanka and Singapore...

 as their mother tongue. They are supposed to have migrated from Tamil Nadu

Tamil Nadu

Tamil Nadu is one of the 28 states of India. Its capital and largest city is Chennai. Tamil Nadu lies in the southernmost part of the Indian Peninsula and is bordered by the union territory of Pondicherry, and the states of Kerala, Karnataka, and Andhra Pradesh...

 to various parts of Kerala through the Western Ghats. Many members of Thulukkar community have migrated to Pakistan

Pakistan

Pakistan , officially the Islamic Republic of Pakistan is a sovereign state in South Asia. It has a coastline along the Arabian Sea and the Gulf of Oman in the south and is bordered by Afghanistan and Iran in the west, India in the east and China in the far northeast. In the north, Tajikistan...

 after independence have settled in Karachi

Karachi

Karachi is the largest city, main seaport and the main financial centre of Pakistan, as well as the capital of the province of Sindh. The city has an estimated population of 13 to 15 million, while the total metropolitan area has a population of over 18 million...

, Sindh

Sindh

Sindh historically referred to as Ba'ab-ul-Islam , is one of the four provinces of Pakistan and historically is home to the Sindhi people. It is also locally known as the "Mehran". Though Muslims form the largest religious group in Sindh, a good number of Christians, Zoroastrians and Hindus can...

. They are called as "anna" in Kerala, owing to Pseudo Tamil Language they Speak.
In north and central Kerala native Muslims are predominant and are called Mappila

Mappila

Mappila or Moplah refers to a Muslim community of Kerala, primarily in the northern region called Malabar, which arose in Malabar as a result of the pre and post Islamic Arab contacts. Significant numbers of the community are also present in the southern districts of Karnataka and western parts of...

. While in the erstwhile Travancore

Travancore

Kingdom of Travancore was a former Hindu feudal kingdom and Indian Princely State with its capital at Padmanabhapuram or Trivandrum ruled by the Travancore Royal Family. The Kingdom of Travancore comprised most of modern day southern Kerala, Kanyakumari district, and the southernmost parts of...

 region, Thulukkars are the common Muslims. Especially in Kollam, Trivandrum, Kottayam, Thodupuzha and Alappuzha.

Many Tamil Muslims migrated to Alappuzha from places like Tirunelveli

Tirunelveli

Tirunelveli , also known as Nellai , and historically as Tinnevelly, is a city in the Indian state of Tamil Nadu. It is the headquarters of the Tirunelveli District and the sixth biggest city in Tamil Nadu...

, Madurai

Madurai

Madurai is the third largest city in the Indian state of Tamil Nadu and one of the oldest continuously inhabited cities in the world. It served as the capital city of the Pandyan Kingdom. It is the administrative headquarters of Madurai District and is famous for its temples built by Pandyan and...

, and Thanjavur during the last 50-60 Years and they are also rightfully Thulukkar.

They speak Tamil-Urdu between them. Most of them follow Hanafi

Hanafi

The Hanafi school is one of the four Madhhab in jurisprudence within Sunni Islam. The Hanafi madhhab is named after the Persian scholar Abu Hanifa an-Nu‘man ibn Thābit , a Tabi‘i whose legal views were preserved primarily by his two most important disciples, Abu Yusuf and Muhammad al-Shaybani...

 School of Islam.

Erattupetta

Erattupetta

Erattupetta is a town in Kottayam district in the state of Kerala, India.It is 38 km east of Kottayam, the District Centre. Erattupetta was known as Erappili and Erappuzha before the Advent of Tamil Muslims into this town. Erattupetta is situated in the foothills of High Ranges. It was the...

 in Kottayam

Kottayam

Kottayam is a city in the Indian state of Kerala, spread over an area of 55.40 km2. It is the administrative capital of the Kottayam district. Kottayam Kottayam (Malayalam: കോട്ടയം) is a city in the Indian state of Kerala, spread over an area of 55.40 km2. It is the administrative...

 district in Central Travancore has a significant Thulukkar population along with Pathanamthitta

Pathanamthitta

Pathanamthitta is a large town and a municipality situated in the central Travancore region in the state of Kerala, south India, spread over an area of 23.50 km2. It is the administrative capital of Pathanamthitta district. The city has a population of 38,000...

 town and Thodupuzha

Thodupuzha

Thodupuzha is a town and a municipality in Idukki district in the Indian state of Kerala, spread over an area of 35.43 km2. It is 62 km from Ernakulam. Geographical Classification of Thodupuzha Region is Midland or Idanad....

.
They have the surnames - Rawther, Labba, Kannu etc.