Malay is an Austronesian language spoken in Malaysia, Indonesia, Singapore, Brunei and Thailand. The total number of speakers of Standard Malay is about 18 million. There are also about 170 million people who speak Indonesian, which is a form of Malay.
The earliest known inscriptions in Malay were found in southern Sumatra and on the island of Bangka and date from 683-6 AD. They were written in an Indian script during the time of the kingdom of Srivijaya.
When Islam arrived in southeast Asia during the 14th century, the Arabic script was adapted to write the Malay language. In the 17th century, under influence from the Dutch and British, the Arabic script was replaced by the Latin alphabet.
source
wikipedia.org,
omniglot.com &
ethnologue.com