Meanings
proper noun
- A surname from Irish.
Origin
- IrishÓ Raghallaigh
- EnglishO'Riley
From Irish Ó Raghallaigh, commonly anglicized as O'Reilly.
More words from Irish
Full word history & related roots →Cite this entry
APA
O'Riley. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/O'Riley
MLA
“O'Riley.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/O'Riley. Accessed November 3, 2026.
Chicago
WatkinsX Dictionary, s.v. “O'Riley,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/O'Riley.
Source: O'Riley on Wiktionary, CC BY-SA 4.0.