Giangan (also known as Klata, Clata, Bagobo, Atto, Eto, Guanga, Gulanga, Jangan) is an Austronesian language of the southern Philippines. It is spoken on the eastern slopes of Mount Apo in Davao del Sur Province, as well as in Davao City (Ethnologue). They occupy a very small territory stretching from Catalunan to Calinan within Davao City.

The nearby Tagabawa language is also known as Bagobo, and is not to be confused with Giangan.

SUGGESTED RE-WRITE:

Klata (also known among themselves as Bagobo Klata, sometimes spelled <Clata> or known to outsiders as Giangan / Jangan, Klatan, Kalatan) is a unique Austronesian language of the southern Philippines. It is spoken on the eastern slopes of Mount Apo in Davao del Sur Province, as well as in Davao City (Ethnologue), where they occupy an area stretching from Catalunan to Calinan. It is notable for the loss of final *n from Austronesian vocabulary [PAN *zalan 'path' > Klata dála; PAN *quzaN 'rain' > Klata ʔulá], for consonant gemination [PAN *Cau 'person' > Klata ʔottów' PMP *hutek 'brain' > ʔottók], and for the shift of PAN or PMP *R to /l/ (mostly to /g/ in surrounding languages) [PMP *Ratus 'hundred' > Klata mlotús, Bisayan gatús; PAN *beRas 'husked rice' > Klata ballás, Tagalog bigás].

The nearby Manobo Obo and Tagabawa languages are also known as Bagobo (an ethnic identifier) but should not to be confused with Klata.

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SUBJECT/HEADLINE
Giangan language must be moved to a new entry: Klata language | Here is the suggested revision after consulting with Klata people and other linguists

Klata (also known among themselves as Bagobo Klata, sometimes spelled <Clata> or known to outsiders as Giangan / Jangan, Klatan, Kalatan) is a unique Austronesian language of the southern Philippines. It is spoken on the eastern slopes of Mount Apo in Davao del Sur Province, as well as in Davao City (Ethnologue), where they occupy an area stretching from Catalunan to Calinan. It is notable for the loss of final *n from Austronesian vocabulary [PAN *zalan 'path' > Klata dála; PAN *quzaN 'rain' > Klata ʔulá], for consonant gemination [PAN *Cau 'person' > Klata ʔottów' PMP *hutek 'brain' > ʔottók], and for the shift of PAN or PMP *R to /l/ (mostly to /g/ in surrounding languages) [PMP *Ratus 'hundred' > Klata mlotús, Bisayan gatús; PAN *beRas 'husked rice' > Klata ballás, Tagalog bigás].

The nearby Manobo Obo and Tagabawa languages are also known as Bagobo (an ethnic identifier) but should not to be confused with Klata.

= = = = = = = = = = = = = = = =
Linguists make a great deal about the terms <ENDONYM> 'what a group of people call themselves' and <EXONYM> 'what other people may call them'. Klata or Bagobo Klata is what they call and have called themselves, and this should be respected. Showing this respect involves moving the main entry to <KLATA>, with an active cross-reference to <GIANGAN> which is an exonym.
In the article, we have found no corroboration for the names: "Atto, Eto, Guanga, Gulanga". The first two seem to be related to *qaRta which is a descriptive for 'Negrito' in many Philippine languages, but the Klata are not genetically Arta, or Atto, or Eto. The last two just seem to be misspellings of <Giangan> but which is actually pronounced [Jangan].
The Klata themselves objected to the wording "They occupy a very small territory stretching from Catalunan to Calinan within Davao City." There is no necessity for using "very small territory" which they find pejorative.