Surname · Irish origin
Reilly
Meaning
The surname Reilly means Descendant of Raghallach.
Origin
Irish
Type
patronymic
Variants
2
The origin of the surname Reilly
Reilly comes from Ó Raghallaigh, a great Cavan name.
What kind of surname is Reilly?
Reilly is a patronymic surname, derived from a father's or ancestor's given name. It belongs to the Irish naming tradition — you can read how Irish surnames were formed on our Irish last names page.
Variants & spellings of Reilly
You may also see this surname written as:
- O'Reilly
- Riley
Other Irish surnames
Other patronymic surnames
Family names formed the same way, from different cultures.
Frequently asked questions
What does the surname Reilly mean?
The surname Reilly means Descendant of Raghallach. Reilly comes from Ó Raghallaigh, a great Cavan name.
Where does the surname Reilly come from?
Reilly is a surname of Irish origin.
What kind of surname is Reilly?
Reilly is a patronymic surname, derived from a father's or ancestor's given name.
What are other spellings of Reilly?
Variant spellings of Reilly include O'Reilly, Riley.
What are other Irish surnames?
Other Irish surnames include Boyle, Brennan, Byrne, Callaghan, Connolly, Daly.