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Name Lineage

    The surname McWilliam

    A patronymic surname, carried by 573 people in the United States.

    3 syllables Soundex M245

    McWilliam: #38,582 of 162,253 surnames in the 2010 US Census #1Smith#160,975Doriott#10Martinez#100Jimenez#1,000Archer#10,001Dubon McWilliam #38,582, 573 people McWilliam: #38,582 of 162,253 surnames in the 2010 US Census #1Smith#100Jimenez McWilliam #38,582, 573 people
    Every surname held by 100 or more people in the 2010 US Census, most common on the left (162,253 in all). McWilliam is more common than 76.2% of them.

    Origin

    Anglicized form of Irish and Scottish Gaelic Mac Uilleim (“son of Uilleam”), a Gaelicized form of William.

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

    Origin from Wiktionary (CC BY-SA 4.0).

    How common it is

    2010 US Census

    There were 573 people named McWilliam in the United States in 2010, about 1 in every 538,823 Americans. That is down 8.8% since 2000, when the Census counted 628.

    #38,582
    rank among US surnames
    573
    people in 2010
    0.2
    per 100,000 Americans
    -8.8%
    change since 2000 (was #34,150)

    Who is named McWilliam

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

    86% of people named McWilliam identified as white (not Hispanic), 8.2% as Black (not Hispanic) and 3.5% as Hispanic or Latino (any race).

    • White (not Hispanic) 86%
    • Black (not Hispanic) 8.2%
    • Hispanic or Latino (any race) 3.5%
    • Two or more races 1.4%
    The Census suppresses very small shares to protect privacy; Asian & Pacific Islander, Native American are not shown.

    Compare: most common surnames among white Americans.

    Spellings and sound-alikes

    Useful when a record has your ancestor under another spelling

    Surnames that sound like McWilliam

    McWilliam has the Soundex code M245, the code US census indexes have used since the 1930s. Every surname with code M245.

    Questions

    Where does the surname McWilliam come from?
    Anglicized form of Irish and Scottish Gaelic Mac Uilleim (“son of Uilleam”), a Gaelicized form of William.
    How common is the surname McWilliam?
    573 people in the United States had the surname McWilliam in the 2010 Census, about 1 in every 538,823 Americans. It ranked 38,582nd of 162,253 surnames.
    What ethnicity is the surname McWilliam?
    In the 2010 Census, 86% of people named McWilliam identified as white (not Hispanic), and 8.2% as Black (not Hispanic).
    What type of surname is McWilliam?
    McWilliam is a patronymic surname, formed from a father’s (or ancestor’s) given name.
    Is the surname McWilliam getting more or less common?
    Less common. 628 people carried it in the 2000 Census and 573 in 2010, down 8.8%.