The ISO name of the ISO code [bpb] is Barbacoas, the name of an extinct people who gave there name to the Barbacoan language family of which Pasto is a member, as well as to the Colombian town of Barbacoas. However, nothing is known of their language, one of several also known as Colima (Loukotka 1968:247), and it can only be assumed to be part of the Barbacoan family (Campbell & Grondona 2012:78). Such unattested, long-extinct languages are not normally assigned ISO codes. MultiTree conflates Barbacoas with neighboring Pasto, which is well-enough attested for classification and assignment of an ISO code. This does not however mean that ISO code [bpb] can be properly used for the Pasto language.