Chamic languages in the context of Sa Huỳnh culture

Cham (Cham: ꨌꩌ, Jawi: چم, Latin script: Cam) is a Malayo-Polynesian language of the Austronesian family, spoken by the Chams of Southeast Asia. It is spoken primarily in the territory of the former Kingdom of Champa, which spanned modern Southern Vietnam, as well as in Cambodia by a significant population which descends from refugees that fled during the decline and fall of Champa. The Western variety is spoken by 220,000 people in Cambodia and 25,000 people in Vietnam. As for the Eastern variety, there are about 73,000 speakers in Vietnam, for a total of approximately 491,448 speakers.

Cham belongs to the Chamic languages, which are spoken in parts of mainland Southeast Asia, Indonesia's Aceh Province, and on the island of Hainan. Cham is the oldest-attested Austronesian language, with the Đông Yên Châu inscription being verifiably dated to the late 4th century AD. It has several dialects, with Eastern Cham (Phan Rang Cham; ꨌꩌ ꨚꨰ, Cam pai) and Western Cham (ꨌꩌ ꨚꨭꩉ, Cam pur) being the main ones. The Cham script, derived from the ancient Indic script, is still used for ceremonial and religious purposes.

Acehnese (/ˌɑːtʃəˈniːz/ AH-chə-NEEZ; Bahsa/Basa Acèh; Jawoë: بهسا اچيه, IPA: [bahsa at͡ʃɛh]), also written as Achinese, is an Austronesian language of the Chamic branch natively spoken by the Acehnese people in Aceh, Sumatra, Indonesia. This language is also spoken by Acehnese descendants in some parts of Malaysia like in Yan District, Kedah. Acehnese is used as the co-official language in the province of Aceh, alongside Indonesian.

Being part of the Chamic languages group, Acehnese is the only Austronesian language of the Chamic branch spoken in Indonesia, its closest relatives are the other Chamic languages, which are principally spoken in Vietnam and Cambodia.

The Đông Yên Châu inscription is an Old Cham inscription written in Pallava script, found in 1936 at Đông Yên Châu, northwest of Trà Kiệu, which used to be the old Champa capital known as Simhapura, in central Vietnam. The inscription was written in prose, is the oldest document of Cham (and indeed of any Austronesian language), and testifies to the existence of indigenous beliefs among the ancient Cham people of the Champa kingdom. Though not itself dated, the phrasing of the inscription is identical to those of dated Sanskrit inscriptions of Bhadravarman I of the second dynasty, who ruled Champa at the end of the 4th century CE. It contains an imprecatory formula ordering respect for the "naga of the king", undoubtedly a reference to the protective divinity of a spring or well. This vernacular text shows that in the 4th century, the land that now constitutes modern-day central Vietnam was inhabited by an Austronesian-speaking population. The evidence, both monumental and palaeographic, also suggests that Hinduism was the predominant religious system.

The fact that the language in the inscription shares some basic grammar and vocabulary with Malay has led some scholars to argue that the inscription contains the oldest specimen of Malay words in the form of Old Malay, older by three centuries than the earliest Srivijayan inscriptions from southeastern Sumatra. However, most scholars consider it established that this inscription was written in Old Cham instead. The shared basic grammar and vocabulary comes as no surprise, since Chamic and Malayic languages are closely related; both are the two subgroups of a Malayic–Chamic group within the Malayo-Polynesian branch of the Austronesian family.