The Datagnon Alphabet

Datagnon is an alternate name for the language also called Ratagnon and Latagnun — a critically endangered Philippine language ^[1] spoken in Occidental Mindoro, Philippines. All three names (Datagnon, Ratagnon, Latagnun) refer to the same speech variety with ISO 639-3 code btn. With fewer than 100 estimated speakers, the language is among the most endangered in the Philippines. It is spoken by members of a small indigenous community in Occidental Mindoro, where it has been displaced by Tagalog and other regional languages.

The variation in names (Datagnon, Ratagnon, Latagnun) reflects different ways the community name or language name was recorded by different researchers and sources over time. Academic linguistic literature most commonly uses the name Ratagnon, while Datagnon and Latagnun appear in some databases and sources. On EveryAlphabet.com, we present all three names to help users find the language regardless of which name they search under.

Yes — Datagnon, Ratagnon, and Latagnun are all names for the same language ^[2] with ISO 639-3 code btn, spoken in Occidental Mindoro, Philippines. The three names are alternate designations for the same speech variety, not separate languages or dialects. This type of multiple naming is common for poorly documented endangered languages where different researchers, government agencies, or community members may use different names when recording or referring to the language.

Linguistic databases such as Ethnologue and Glottolog list the language primarily as Ratagnon, with Datagnon and Latagnun as alternate names. The alphabet and grammatical features are identical across all three names since they describe the same language. EveryAlphabet.com presents separate pages for Datagnon, Ratagnon, and Latagnun to ensure comprehensive coverage for users searching under any of these names.

Datagnon (Ratagnon) belongs to the Malayo-Polynesian branch of Austronesian ^[2], specifically within the Mindoro language subgroup of Philippine languages. The Mindoro languages are a cluster of Austronesian languages spoken on Mindoro island that form a distinct subgroup within the Philippine linkage. These languages developed their distinct characteristics after the ancient Austronesian settlement of Mindoro island, which lies southwest of Luzon in the Philippine archipelago.

The Philippine Austronesian languages, including Datagnon (Ratagnon), are descendants of the ancient Austronesian expansion from Taiwan approximately 4,000-5,000 years ago. The Philippines became one of the most linguistically diverse regions in the Austronesian world, with over 170 living languages. Datagnon (Ratagnon) represents one of the most endangered members of this rich linguistic heritage, and its documentation is important for understanding the full scope of Philippine Austronesian diversity.

Datagnon uses the Latin alphabet ^[1] with 20 letters: 5 vowels (A, E, I, O, U), 14 consonants (B, D, G, H, K, L, M, N, P, R, S, T, W, Y), and the Ng digraph. This is the same alphabet structure used in the Ratagnon and Latagnun pages on EveryAlphabet.com, as all three names refer to the same language. The Latin alphabet was introduced to the Philippines during the Spanish colonial period and became the standard writing system for Philippine languages.

As with other Philippine languages, the Ng digraph in Datagnon (Ratagnon) represents the velar nasal consonant (the sound heard at the end of "sing" in English) and can appear at the beginning of words. The Latin orthography used for Datagnon in linguistic documentation follows conventions similar to those used for other Philippine languages such as Tagalog. The glottal stop is phonemically significant in the language but is not always marked in the written orthography.

EveryAlphabet.com maintains separate pages for Datagnon, Ratagnon, and Latagnun ^[1] because users searching for this language may use any of the three names. By having a dedicated page for each name, we ensure that all users — regardless of which name they encounter in their research, textbooks, or other sources — can find comprehensive information about the language and its alphabet. This approach mirrors how linguistic databases like Ethnologue list primary names and alternate names.

All three pages (Datagnon, Ratagnon, and Latagnun) reference the same SIL Ethnologue entry and Glottolog entry for the Ratagnon language (ISO 639-3: btn). The content acknowledges that these are alternate names for the same language and cross-references the other pages. We do not create separate SIL or Glottolog reference entries for Datagnon or Latagnun, as these names do not have independent entries in those databases — they share the Ratagnon entry.