Meanings
proper noun
- A surname from Irish.
Origin
Variant of Callahan.
Full word history & related roots →Cite this entry
APA
O'Callaghan. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/O'Callaghan
MLA
“O'Callaghan.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/O'Callaghan. Accessed November 3, 2026.
Chicago
WatkinsX Dictionary, s.v. “O'Callaghan,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/O'Callaghan.
Source: O'Callaghan on Wiktionary, CC BY-SA 4.0.