Question: Where was the unclassified language of the people who were sometimes referred to as Cocos heard?

Context paragraphs:
Omurano language: Omurano is an unclassified language from Peru.  It is also known as Humurana, Roamaina, Numurana, Umurano, and Mayna.  The language was presumed to have become extinct by 1958, but in 2011 a rememberer was found who knew some 20 words in Omurano; he claimed that there were still people who could speak it.

Murkim language: Murkim is a Papuan language spoken in Western New Guinea, near its probable relative Lepki and the unclassified language Kembra.  Though spoken by fewer than 300 people, it is being learned by children.

Karankawa people: Karankawa (also Karankawan, Comanches, Cocos, and called in their language Auia) are a tribe of Native Americans, now a restored nation, who played a pivotal part in early Texas history.

Carrier language: The Carrier language is a Northern Athabaskan language.  It is named after the Dakelh people, a First Nations people of the Central Interior of British Columbia, Canada, for whom Carrier is the usual English name.  People who are referred to as Carrier speak two related languages.  One, Babine-Witsuwit'en is sometimes referred to as "Northern Carrier".  The other, Carrier proper, includes what are sometimes referred to as "Central Carrier" and "Southern Carrier".

Kwaza language: Kwaza (also written Kwazá or Koaiá) is an endangered language spoken by the Kwaza people of Brazil.  Like many other languages in the area, it is an unclassified language, but there are hypothesized long-distance genetic relationships.

Laal language: Laal is an unclassified language spoken by 749 people (as of 2000 ) in three villages in the Moyen-Chari prefecture of Chad on opposite banks of the Chari River,

Catuquinaru language: Catuquinarú is the extinct and unclassified language of the Catuquinaru tribe of Brazil, preserved in a few words collected by Jose Bach and published by G. E. Church in 1898.  The name is a common derivative of "Catuquina".  Loukotka includes it among the Tupi languages, describing the people as Tupinized Catuquina.  However, the little preserved vocabulary does not resemble that of the Tupi languages, Catuquinan languages, or Panoan languages (compare Panoan Catuquina).

Dompo language: Dompo is an endangered unclassified language of Ghana.  Speakers are shifting to Nafaanra.  It is spoken adjacent to the main town of the Nafaanra people, Banda, Brong-Ahafo Region, Ghana.

Karankawa language: Karankawa is the extinct, unclassified language of the Texas coast, where the Karankawa people migrated between the mainland and the .  It was not closely related to other known languages in the area, much of which are also poorly attested, and may have been a language isolate.  A couple hundred words are preserved, collected in 1698, 1720, and 1828; in the 1880s, three lists were collected from non-Karankawa who knew some words.

Kambiwá language: Kambiwá a.k.a. Cambioá is an extinct unclassified language of Brazil.  A couple dozen words were collected from two people in the 1960s, but by that time no-one spoke the language any longer.  Apart from two apparent borrowings, none of the words are relatable to known languages.  Loukotka (1968) characterized the language as unclassifiable due to lack of data.

Supporting paragraphs: Karankawa language Karankawa people
Answer: the Texas coast