Siouan languages
Authors who call the entire family "Siouan" distinguish the two branches as "Western Siouan" and "Eastern Siouan" or as "Siouan-proper" and "Catawban". Others restrict the name "Siouan" to the western branch and use the name "Siouan–Catawban" for the entire family. Generally, however, the name "Siouan" is used without distinction.
Quapaw language
The Quapaw language does not conform well to English language phonetics, and a writing system for the language has not been formally adopted. All of the existing source material on the language utilizes different writing systems, making reading and understanding the language difficult for the novice learner. To address this issue, an online dictionary of the Quapaw language is being compiled which incorporates all of the existing source material known to exist into one document using a version of the International Phonetic Alphabet which has been adapted for Siouan languages.