Male form
- Nominative
- Seán Ó Caithnia
- Genitive
- Sheáin Uí Chaithnia
- Vocative
- a Sheáin Uí Chaithnia
Wife form
- Nominative
- Síle Uí Chaithnia
- Genitive
- Shíle Uí Chaithnia
- Vocative
- a Shíle Uí Chaithnia
Daughter form
- Nominative
- Síle Ní Chaithnia
- Genitive
- Shíle Ní Chaithnia
- Vocative
- a Shíle Ní Chaithnia
Male form
- Nominative
- Seán Ó Caithniadh
- Genitive
- Sheáin Uí Chaithniadh
- Vocative
- a Sheáin Uí Chaithniadh
Wife form
- Nominative
- Síle Uí Chaithniadh
- Genitive
- Shíle Uí Chaithniadh
- Vocative
- a Shíle Uí Chaithniadh
Daughter form
- Nominative
- Síle Ní Chaithniadh
- Genitive
- Shíle Ní Chaithniadh
- Vocative
- a Shíle Ní Chaithniadh