Male form
- Nominative
- Seán Ó Duifinn
- Genitive
- Sheáin Uí Dhuifinn
- Vocative
- a Sheáin Uí Dhuifinn
Wife form
- Nominative
- Síle Uí Dhuifinn
- Genitive
- Shíle Uí Dhuifinn
- Vocative
- a Shíle Uí Dhuifinn
Daughter form
- Nominative
- Síle Ní Dhuifinn
- Genitive
- Shíle Ní Dhuifinn
- Vocative
- a Shíle Ní Dhuifinn
Male form
- Nominative
- Seán Ó Duibhfinn
- Genitive
- Sheáin Uí Dhuibhfinn
- Vocative
- a Sheáin Uí Dhuibhfinn
Wife form
- Nominative
- Síle Uí Dhuibhfinn
- Genitive
- Shíle Uí Dhuibhfinn
- Vocative
- a Shíle Uí Dhuibhfinn
Daughter form
- Nominative
- Síle Ní Dhuibhfinn
- Genitive
- Shíle Ní Dhuibhfinn
- Vocative
- a Shíle Ní Dhuibhfinn