1 in 66.76

The odds a person has a unique last name are 1 in 66.76 (US, 2000).

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Last Name
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Sources & Definitions

 

Source(s)

Top 1000 Names [Internet]. U.S. Census Bureau; Available from: http://www.census.gov/genealogy/www/freqnames2k.html

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Odds Statement provided by Book of Odds Inc., http://www.bookofodds.com/content/view/full/501103 (Accessed: )

Rounding Rules

Odds more likely than 1 in 10, such as 1 in 3.42, are rounded to three significant digits. Odds less likely than 1 in 10, such as 1 in 420.4, are rounded to four significant digits. Trailing zeros after the decimal point are dropped for readability, even though they may still be significant.

Odds you'll see: 1 in 4.26; 14.5; 143; 5,230; 433,200

Odds you won't see: 1 in 2.412; 63.042; 425,242c

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Comments (2)

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jreiss
Comment

P.S. to previous note: here is the article I was referring to.
http://www.bookofodds.com/Relationships-Society/Demographics/Articles/Is-Your-Last-Name-Unique

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jreiss
Comment

Please note, as the article they cite makes it clear, this is not really the correct odds but rather the odds that typos will make it appear unique. Not a good sign for researchers who use census data extensively.

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