Root form: Cathasach
Irish-language surnames
Ó Cathasaigh, Uí Chathasaigh, Ní Chathasaigh
Male form
- Nominative
- Seán Ó Cathasaigh
- Genitive
- Sheáin Uí Chathasaigh
- Vocative
- a Sheáin Uí Chathasaigh
Wife form
- Nominative
- Síle Uí Chathasaigh
- Genitive
- Shíle Uí Chathasaigh
- Vocative
- a Shíle Uí Chathasaigh
Daughter form
- Nominative
- Síle Ní Chathasaigh
- Genitive
- Shíle Ní Chathasaigh
- Vocative
- a Shíle Ní Chathasaigh
English-language surnames
- Casey
Alternative English-language surnames
- O’Casey