I have Thai ancestry from my mother side... but I dont speak Thai...:exhausted
So I'm a "Thai with Malay mother tongue"?
Salamu3alaikum warahmatullah,
I'm not really sure about that, since you speak Malay you can still identify yourself as a Malay or maybe you can learn Thai, it is easy and you can explore your mother's culture. Good for da3wa purpose :statisfie Muslim who speak Thai at home in north Malaysia also identify themselves as Malay. Thai is spoken in several northern Kedah's districts such as in Kubang Pasu, Pendang, and in Perlis. We call it as "pood ban" or "speak village or house". Thai in Kedah is different from one in Bangkok as it is mixed with Malay and some term is Islamic such as Naksah for Musolla, Jahama for Muqaddam (the simple surah's of Quran), and Melelei for Madrasah.
Too bad not many younger generation speak Thai today maybe because of National education system. I think it is good for younger generation to speak Malay and respecting other Malay speakers by speaking standard and understandable language but in the negative side is that they are ashame with their ancestry
Actually native ethnicity in Kedah is a bit confusing and special the same as those in Kelantan since its long history which began at 1st century AD. The different is Kedah people never try to differentiate themselves from others like Kelantan people. Langkasuka kingdom was first being build in Kedah before it was moved to Patani in Southern Thailand today. People of Langkasuka ethnicity are still exist today in Malayan Peninsula particularly in Kedah and Southern Thailand though they identify themselves as Thai or Malay and they are mixed with people around the world so it is very hard to identify themselves except by checking the history line of the ancient kingdom. They are actually sharing the same ancestry with the Khmer and Mon people of Cambodia and Myanmar, while for Thai ethnic they are from southern China. They absorbed many locals vocabulary which is ancient Khmer as ancient Khmer is rich in civilization. They also modify Khmer script and adopt it as Thai script. This happens in 12th century AD during Sukhothai dynasty in Thailand.
The term Malay is not only for a particular race, it is synonimous with Islam in South East Asia mainland as Malay language is used as a medium of preaching Islam to the natives, it is used widely in several native kingdom's as the language of administration

hew As for Indonesian, Malay is a tribe in Palembang, Riau, and South Sumatera.
Love to brothers and sisters in faith