Boon or Af-Boon is a nearly extinct Cushitic language spoken by 59 people (as of 2000) in Jilib District, Middle Jubba Region of southern Somalia.
[2] Lamberti[3] and following him Ethnologue and Glottolog leave the language unclassified within Eastern Cushitic.
[1][4] Blench (2006) leaves it as unclassified within Cushitic, as records are too fragmentary to allow more than that.
[5] Unlike in the Somali languages, nouns and pronouns in Boon often end in vowels, e.g. afi 'mouth', hididi 'vein', illa 'eye', luki 'leg'; hebla 'he' (cf.
standard Somali af, xidid, il, lug; hebel 'someone').