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Name Lineage

    The surname Muldoon

    An Irish patronymic surname, carried by 4,084 people in the United States.

    2 syllables Soundex M435

    Muldoon: #8,121 of 162,253 surnames in the 2010 US Census #1Smith#160,975Doriott#10Martinez#100Jimenez#1,000Archer Muldoon #8,121, 4,084 people Muldoon: #8,121 of 162,253 surnames in the 2010 US Census #1Smith#160,975Doriott#100Jimenez Muldoon #8,121, 4,084 people
    Every surname held by 100 or more people in the 2010 US Census, most common on the left (162,253 in all). Muldoon is more common than 95% of them.

    Origin

    Irish origin

    From Irish Ó Maoldúin (“descendant of Maoldúin”), from Ó + Maoldúin.

    Muldoon is a patronymic surname: formed from a father’s (or ancestor’s) given name.

    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 4,084 people named Muldoon in the United States in 2010, about 1 in every 75,599 Americans. That is up 1.8% since 2000, when the Census counted 4,011.

    #8,121
    rank among US surnames
    4,084
    people in 2010
    1.4
    per 100,000 Americans
    +1.8%
    change since 2000 (was #7,646)
    RankSurnamePeople1 in
    #8,113Deans4,08775,543
    #8,114Rosenblum4,08675,562
    #8,119Mastin4,08575,580
    #8,121Klassen4,08475,599
    #8,124Brodsky4,08375,617
    #8,126Gamache4,08275,636
    #8,127Crew4,08175,654

    Who is named Muldoon

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

    95% of people named Muldoon identified as white (not Hispanic), 2.2% as Hispanic or Latino (any race).

    • White (not Hispanic) 95%
    • Hispanic or Latino (any race) 2.2%
    • Two or more races 0.9%
    • Asian and Pacific Islander 0.8%
    • American Indian and Alaska Native 0.7%
    • Black (not Hispanic) 0.2%

    Compare: most common surnames among white Americans.

    Famous Muldoons

    2 notable people on Wikidata, most written-about first

    • Patrick Muldoon
      American actor (1968–2026)
    • John Muldoon
      American rugby union player (1896-1944)

    Spellings and sound-alikes

    Useful when a record has your ancestor under another spelling

    Surnames that sound like Muldoon

    Muldoon has the Soundex code M435, the code US census indexes have used since the 1930s. Every surname with code M435.

    Other Irish surnames

    All 880 Irish surnames

    Questions

    Where does the surname Muldoon come from?
    From Irish Ó Maoldúin (“descendant of Maoldúin”), from Ó + Maoldúin.
    How common is the surname Muldoon?
    4,084 people in the United States had the surname Muldoon in the 2010 Census, about 1 in every 75,599 Americans. It ranked 8,121st of 162,253 surnames.
    What ethnicity is the surname Muldoon?
    In the 2010 Census, 95% of people named Muldoon identified as white (not Hispanic), and 2.2% as Hispanic or Latino (any race).
    Who is the most famous person named Muldoon?
    Patrick Muldoon, American actor (1968–2026), followed by John Muldoon.
    Where is the surname Muldoon most common?
    Wikidata records people named Muldoon in the United States.
    What type of surname is Muldoon?
    Muldoon is a patronymic surname, formed from a father’s (or ancestor’s) given name.
    Is the surname Muldoon getting more or less common?
    More common. 4,011 people carried it in the 2000 Census and 4,084 in 2010, up 1.8%.