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    The surname O'Callaghan

    An Irish surname, carried by 3,014 people in the United States.

    4 syllables Soundex O242

    O'Callaghan: #10,626 of 162,253 surnames in the 2010 US Census #1Smith#160,975Doriott#10Martinez#100Jimenez#1,000Archer O'Callaghan #10,626, 3,014 people O'Callaghan: #10,626 of 162,253 surnames in the 2010 US Census #1Smith#160,975Doriott#100Jimenez O'Callaghan #10,626, 3,014 people
    Every surname held by 100 or more people in the 2010 US Census, most common on the left (162,253 in all). O'Callaghan is more common than 93.5% of them.

    Origin

    Irish origin

    Variant of Callahan.

    One of 880 Irish surnames on this site.

    Origin from Wiktionary (CC BY-SA 4.0).

    How common it is

    2010 US Census

    There were 3,014 people named O'Callaghan in the United States in 2010, about 1 in every 102,437 Americans. That is up 8.5% since 2000, when the Census counted 2,779.

    #10,626
    rank among US surnames
    3,014
    people in 2010
    1.0
    per 100,000 Americans
    +8.5%
    change since 2000 (was #10,588)
    RankSurnamePeople1 in
    #10,620Cardillo3,015102,403
    #10,626Leclerc3,014102,437
    #10,628Stefan3,013102,471
    #10,631Kula3,012102,505

    Who is named O'Callaghan

    Race and Hispanic origin as people reported it in the 2010 Census

    95% of people named O'Callaghan identified as white (not Hispanic), 2.0% as Hispanic or Latino (any race) and 1.6% as two or more races.

    • White (not Hispanic) 95%
    • Hispanic or Latino (any race) 2.0%
    • Two or more races 1.6%
    • Asian and Pacific Islander 0.7%
    • Black (not Hispanic) 0.3%

    Compare: most common surnames among white Americans.

    Famous O'Callaghans

    1 notable person on Wikidata, most written-about first

    • Mollie O'Callaghan
      Australian swimmer, born 2004

    Other Irish surnames

    All 880 Irish surnames

    Questions

    Where does the surname O'Callaghan come from?
    Variant of Callahan.
    How common is the surname O'Callaghan?
    3,014 people in the United States had the surname O'Callaghan in the 2010 Census, about 1 in every 102,437 Americans. It ranked 10,626th of 162,253 surnames.
    What ethnicity is the surname O'Callaghan?
    In the 2010 Census, 95% of people named O'Callaghan identified as white (not Hispanic), and 2.0% as Hispanic or Latino (any race).
    Who is the most famous person named O'Callaghan?
    Mollie O'Callaghan, Australian swimmer.
    Where is the surname O'Callaghan most common?
    Wikidata records people named O'Callaghan in Australia.
    Is the surname O'Callaghan getting more or less common?
    More common. 2,779 people carried it in the 2000 Census and 3,014 in 2010, up 8.5%.