Arawak language
Jolkesky (2016) notes that there are lexical similarities with the Jivaro, Máku, Mura-Matanawi, Puinave-Nadahup, Taruma, Tupi, Yanomami, and Arawak language families due to contact. This suggests that Katukinan and the language families with which it was in contact with had been earlier spoken within a central Amazon interaction sphere.