rarissimum 72: number marking (for plural and dual) on personal pronouns (suppletive) as well as on expressives (or ideophones; by suffix, which is unusual in Mon-Khmer, a family otherwise preferring prefixes and infixes), but not on any other word class (including nouns and verbs)
Where found
Bahnar (or Bahnaric in general?) (Mon-Khmer, Austro-Asiatic)