Subtiaba is an extinct Oto-Manguean language which was spoken on the Pacific slope of Nicaragua, especially in the Subtiaba district of León. Edward Sapir established a connection between Subtiaba and Tlapanec. When Lehmann wrote about it in 1909 it was already very endangered or moribund.
The name "Subtiaba" may be of Nahuatl origin, from the roots xoctli ("black snail") and atl ("water").
The Tlapanec /ˈtlæpənɛk/, or Meꞌphaa, are an Indigenous people of Mexico native to the state of Guerrero. The Tlapanec language is a part of the Oto-Manguean language family, and is closely related to the now extinct Subtiaba language of Nicaragua. Today, Tlapanecs live primarily in the state of Guerrero and number more than 98,000.
In pre-Columbian times they lived in the isolated mountain area along the Costa Chica region of Guerrero, just southeast of present-day Acapulco. Their territory was called Yopitzinco by the Aztecs who also referred to the Tlapanecs as Yopi. Yopitzinco was never conquered by the Aztecs and remained an independent enclave within the Aztec empire. The main Tlapanec city was Tlapan and the name Tlapanec is the Nahuatl for "Inhabitant of Tlapan".
View the full Wikipedia page for Tlapanec people