Root form: Cógan
Irish-language surnames
de Cógan, de Cógan
Male form
- Nominative
- Seán de Cógan
- Genitive
- Sheáin de Cógan
- Vocative
- a Sheáin de Cógan
Female form
- Nominative
- Síle de Cógan
- Genitive
- Shíle de Cógan
- Vocative
- a Shíle de Cógan
English-language surnames
- Cogan
Alternative English-language surnames
- Coggan
- Goggin