The Arafundi languages are a small family of clearly related languages, namely
Alfendio is an old synonym for Arafundi, from when it was still considered a single language.
Laycock (1973) grouped the Arafundi languages with the Ramu languages, although (according to his comments in the introduction) this grouping was apparently impressionistic and not based on either reconstructive work or lexicostatistics. Ross (2005) retains Laycock's grouping without comment. However, Foley (2005) does not include Arafundi within Ramu, and Ethnologue (2009) shows them as an independent family. Foley has suggested instead that the Arafundi and Piawi languages may be related (Comrie 1992), a position confirmed by Timothy Usher.
- Comrie, Bernard. "The recognition of the Piawi language family." In Tom Dutton, Malcolm Ross and Darrell Tryon, eds. The language game: Papers in memory of Donald C. Laycock. 111-113. Canberra: Pacific Linguistics, 1992.
- Foley, William A. (2005). "Linguistic prehistory in the Sepik–Ramu basin". In Andrew Pawley; Robert Attenborough; Robin Hide; Jack Golson. Papuan pasts: cultural, linguistic and biological histories of Papuan-speaking peoples. Canberra: Pacific Linguistics. ISBN 0858835622. OCLC 67292782.
- Laycock, Donald. Sepik languages - checklist and preliminary classification. Pacific Linguistics B-25. Canberra, 1973.
- Ross, Malcolm (2005). "Pronouns as a preliminary diagnostic for grouping Papuan languages". In Andrew Pawley; Robert Attenborough; Robin Hide; Jack Golson. Papuan pasts: cultural, linguistic and biological histories of Papuan-speaking peoples. Canberra: Pacific Linguistics. pp. 15&ndash, 66. ISBN 0858835622. OCLC 67292782.