Male form
- Nominative
- Seán Ó Lachtna
- Genitive
- Sheáin Uí Lachtna
- Vocative
- a Sheáin Uí Lachtna
Wife form
- Nominative
- Síle Uí Lachtna
- Genitive
- Shíle Uí Lachtna
- Vocative
- a Shíle Uí Lachtna
Daughter form
- Nominative
- Síle Ní Lachtna
- Genitive
- Shíle Ní Lachtna
- Vocative
- a Shíle Ní Lachtna
Male form
- Nominative
- Seán Ó Maolachtna
- Genitive
- Sheáin Uí Mhaolachtna
- Vocative
- a Sheáin Uí Mhaolachtna
Wife form
- Nominative
- Síle Uí Mhaolachtna
- Genitive
- Shíle Uí Mhaolachtna
- Vocative
- a Shíle Uí Mhaolachtna
Daughter form
- Nominative
- Síle Ní Mhaolachtna
- Genitive
- Shíle Ní Mhaolachtna
- Vocative
- a Shíle Ní Mhaolachtna