| SG | PL | |
| NOM | arunaš (rule) | arunaeš (rule) |
| ACC | arunan (rule) | ? (rule) |
| GEN | arunaš (rule) | arunaš (rule) |
| DAT | aruni (rule) | arunaš (rule) |
| LOC | aruni (rule) | arunaš (rule) |
| ALL | aruna (rule) | ? (rule) |
| ERG | arunaanza (rule) | arunaanteš (rule) |
| ABL | arunaz (rule) | |
| INS | arunat (rule) |