How common is the surname Riordan?

7,848 people in the United States had the surname Riordan in the 2010 Census, about 1 in every 39,341 Americans. It ranked 4,515th of 162,253 surnames.

What ethnicity is the surname Riordan?

In the 2010 Census, 95% of people named Riordan identified as white (not Hispanic), and 2.1% as Hispanic or Latino (any race).

Who is the most famous person named Riordan?

Rick Riordan, American author (born 1964), followed by Mike Riordan.

Where is the surname Riordan most common?

Wikidata records people named Riordan in the United States and Spain.

Is the surname Riordan getting more or less common?

More common. 7,394 people carried it in the 2000 Census and 7,848 in 2010, up 6.1%.

The surname Riordan

A surname, carried by 7,848 people in the United States.

2 syllables Soundex R635

Every surname held by 100 or more people in the 2010 US Census, most common on the left (162,253 in all). Riordan is more common than 97.2% of them.

Origin

A surname.

Origin from Wiktionary (CC BY-SA 4.0).

How common it is

2010 US Census

There were 7,848 people named Riordan in the United States in 2010, about 1 in every 39,341 Americans. That is up 6.1% since 2000, when the Census counted 7,394.

#4,515

rank among US surnames

7,848

people in 2010

2.7

per 100,000 Americans

+6.1%

change since 2000 (was #4,433)

Rank	Surname	People	1 in
#4,506	Swearingen	7,872	39,221
#4,507	Guess	7,871	39,226
#4,509	Quesada	7,870	39,231
#4,510	Mei	7,867	39,246
#4,512	Hyland	7,862	39,271
#4,513	Lemaster	7,858	39,291
#4,514	Ballew	7,857	39,296

Who is named Riordan

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

95% of people named Riordan identified as white (not Hispanic), 2.1% as Hispanic or Latino (any race) and 1.3% as two or more races.

White (not Hispanic) 95%
Hispanic or Latino (any race) 2.1%
Two or more races 1.3%
Asian and Pacific Islander 0.9%
Black (not Hispanic) 0.7%
American Indian and Alaska Native 0.2%

Compare: most common surnames among white Americans.

Famous Riordans

4 notable people on Wikidata, most written-about first

Rick Riordan
American author (born 1964)
Mike Riordan
American basketball player, born 1945
Richard Riordan
American businessman and politician, 1930–2023
Fergus Riordan
British actor, born 1997

Notable Riordans come mostly from the United States (3) and Spain (1).

Questions

How common is the surname Riordan?: 7,848 people in the United States had the surname Riordan in the 2010 Census, about 1 in every 39,341 Americans. It ranked 4,515th of 162,253 surnames.
What ethnicity is the surname Riordan?: In the 2010 Census, 95% of people named Riordan identified as white (not Hispanic), and 2.1% as Hispanic or Latino (any race).
Who is the most famous person named Riordan?: Rick Riordan, American author (born 1964), followed by Mike Riordan.
Where is the surname Riordan most common?: Wikidata records people named Riordan in the United States and Spain.
Is the surname Riordan getting more or less common?: More common. 7,394 people carried it in the 2000 Census and 7,848 in 2010, up 6.1%.