Root form: Oistigín
Irish-language surnames
Mac Oistigín, Mhic Oistigín, Nic Oistigín
Male form
- Nominative
- Seán Mac Oistigín
- Genitive
- Sheáin Mhic Oistigín
- Vocative
- a Sheáin Mhic Oistigín
Wife form
- Nominative
- Síle Mhic Oistigín
- Genitive
- Shíle Mhic Oistigín
- Vocative
- a Shíle Mhic Oistigín
Daughter form
- Nominative
- Síle Nic Oistigín
- Genitive
- Shíle Nic Oistigín
- Vocative
- a Shíle Nic Oistigín
English-language surnames
- Costigan