Besawunena, attested only from a word list collected by Kroeber, differs only slightly from Arapaho, but a few of its sound changes resemble those seen in Gros Ventre. It had speakers among the Northern Arapaho as recently as the late 1920s.
Nawathinehena is also attested only from a word list collected by Kroeber, and was the most divergent language of the group.
Another reported Arapahoan variety is the extinct Ha'anahawunena, but there is no documentation of it.
- Hammarström, Harald; Forkel, Robert; Haspelmath, Martin, eds. (2017). "Arapahoic". Glottolog 3.0. Jena, Germany: Max Planck Institute for the Science of Human History.
- Lewis, M. Paul (ed.), 2009. Ethnologue: Languages of the World, Sixteenth edition. Dallas, Tex.: SIL International
- Goddard 2001:74-76, 79
- Goddard, Ives (2001). "The Algonquian Languages of the Plains." In Plains, Part I, ed. Raymond J. DeMallie. Vol. 13 of Handbook of North American Indians, ed. William C. Sturtevant. Washington, D.C.: Smithsonian Institution, pp. 71–79.
- Marianne Mithun (1999). The Languages of Native North America. Cambridge Language Surveys. Cambridge: Cambridge University Press.