About the O'Mulligan Surname

Behind the O'Mulligan surname stands Mulligan, an Irish name that clerks and families wrote in more than one way. Read literally, O'Mulligan points to “Descendant of Maolagán”.

• Other spellings include Milligan and Mulgan.
• O'Mulligan simply joins the particle O' to Mulligan, a pattern common in Irish naming.

Family crest and blazon

Arms linked to Mulligan and its spellings were granted to individual families; our heraldry team traces which line they belonged to. Research your O'Mulligan family history with a full surname report and painted coat of arms.