| SG | PL | |
| NOM | u̯aštāiš (rule) | u̯aštaieš (rule) |
| ACC | u̯aštain (rule) | ? (rule) |
| GEN | u̯aštaiaš (rule) | u̯aštaiš (rule) |
| DAT | u̯aštaii (rule) | u̯aštaiaš (rule) |
| LOC | u̯aštaii (rule) | u̯aštaiaš (rule) |
| ALL | u̯aštaia (rule) | ? (rule) |
| ERG | ? (rule) | ? (rule) |
| ABL | u̯aštaiz (rule) | |
| INS | ? (rule) | ? (rule) |