| Gender | Unisex |
|---|---|
| Language | English |
| Origin | |
| Language | Irish |
| Word/name | Ó hÁilgheasa |
| Meaning | "descendant of Áilgheas" |
| Other names | |
| Cognates | Hallessy, Hallisey, Hallisy, Hallissy, Hallisay, Halasey, O Hallishy, O Hallyse |
Hallissey is an English-language surname, derived from the Irish-language, and traditionally associated with the Irish counties of Cork and Kerry.
The name is derived from the Irish Ó hÁilgheasa, a patronym meaning "descendant of Áilgheas". The latter personal name is derived from the Irish áilgheas, meaning "eagerness". The modern Irish form of the name is Ó hÁileasa.
Other English-language surnames cognate to Hallissey include Hallessy, Hallisey, Hallisy, Hallissy, Hallisay, Halasey, O Hallishy, and O Hallyse.
The surname Hallissey is traditionally found in County Cork and County Kerry, particularly in west Cork and south Kerry.