| Singular Nominative | íosmhéid |
| Singular Genitive | íosmhéide; íosmhéid |
| Plural Nominative | íosmhéideanna |
| Plural Genitive | íosmhéideanna |
| Singular Nominative | an íosmhéid; an t-íosmhéid |
| Singular Genitive | na híosmhéide; an íosmhéid |
| Plural Nominative | na híosmhéideanna |
| Plural Genitive | na n-íosmhéideanna |