| Case | Singular | Plural |
|---|---|---|
| nom | ostrovid | ostrovidi, ostrovidové |
| gen | ostrovida | ostrovidů |
| dat | ostrovidovi, ostrovidu |
ostrovidům |
| acc | ostrovida | ostrovidy |
| voc | ostrovide | ostrovidi, ostrovidové |
| loc | ostrovidovi, ostrovidu |
ostrovidech |
| instr | ostrovidem | ostrovidy |