Root form: Niall
Irish-language surnames
Ó Néill, Uí Néill, Ní Néill
Male form
- Nominative
- Seán Ó Néill
- Genitive
- Sheáin Uí Néill
- Vocative
- a Sheáin Uí Néill
Wife form
- Nominative
- Síle Uí Néill
- Genitive
- Shíle Uí Néill
- Vocative
- a Shíle Uí Néill
Daughter form
- Nominative
- Síle Ní Néill
- Genitive
- Shíle Ní Néill
- Vocative
- a Shíle Ní Néill
Mac Néill, Mhic Néill, Nic Néill
Male form
- Nominative
- Seán Mac Néill
- Genitive
- Sheáin Mhic Néill
- Vocative
- a Sheáin Mhic Néill
Wife form
- Nominative
- Síle Mhic Néill
- Genitive
- Shíle Mhic Néill
- Vocative
- a Shíle Mhic Néill
Daughter form
- Nominative
- Síle Nic Néill
- Genitive
- Shíle Nic Néill
- Vocative
- a Shíle Nic Néill
English-language surnames
- O’Neill
- McNeill
- Neill