Root form: Giollán
Irish-language surnames
Ó Giolláin, Uí Ghiolláin, Ní Ghiolláin
Male form
- Nominative
- Seán Ó Giolláin
- Genitive
- Sheáin Uí Ghiolláin
- Vocative
- a Sheáin Uí Ghiolláin
Wife form
- Nominative
- Síle Uí Ghiolláin
- Genitive
- Shíle Uí Ghiolláin
- Vocative
- a Shíle Uí Ghiolláin
Daughter form
- Nominative
- Síle Ní Ghiolláin
- Genitive
- Shíle Ní Ghiolláin
- Vocative
- a Shíle Ní Ghiolláin
English-language surnames
- Gillen
- Gillan