Male form
- Nominative
- Seán Mac Niallais
- Genitive
- Sheáin Mhic Niallais
- Vocative
- a Sheáin Mhic Niallais
Wife form
- Nominative
- Síle Mhic Niallais
- Genitive
- Shíle Mhic Niallais
- Vocative
- a Shíle Mhic Niallais
Daughter form
- Nominative
- Síle Nic Niallais
- Genitive
- Shíle Nic Niallais
- Vocative
- a Shíle Nic Niallais
Male form
- Nominative
- Seán Mac Niallghuis
- Genitive
- Sheáin Mhic Niallghuis
- Vocative
- a Sheáin Mhic Niallghuis
Wife form
- Nominative
- Síle Mhic Niallghuis
- Genitive
- Shíle Mhic Niallghuis
- Vocative
- a Shíle Mhic Niallghuis
Daughter form
- Nominative
- Síle Nic Niallghuis
- Genitive
- Shíle Nic Niallghuis
- Vocative
- a Shíle Nic Niallghuis