How Many People Are Named Cassidy Williams?
There are approximately 345 people named Cassidy Williams living in the United States today. That makes this name combination uncommon, occurring at a rate of about 1 in 993,491 Americans.
This estimate combines SSA birth records for the first name Cassidy with Census Bureau frequency data for the surname Williams. Below you will find a breakdown of both names, including popularity trends, gender data, and ancestry information.
Estimated People with This Name
345
1 in 993,491 Americans
Combination Rarity
Uncommon
First Name
View full profileCassidy
Last Name
View full profileWilliams
Cassidy: Popularity Over Time
Year-by-year SSA birth registrations for the first name Cassidy. The peak year was 1999 with 3,449 births. The average person named Cassidy today is 24 years old.
Ancestry of the Williams Surname
Self-reported race and ethnicity breakdown for people with the surname Williams, from the 2010 U.S. Census Bureau.
How we calculated this
The first name "Cassidy" has an estimated frequency of 0.0183% among living Americans, based on SSA birth records from 1880 to 2024 adjusted for mortality using CDC 2023 life tables.
The surname "Williams" appears at a rate of 550.97 per 100,000 people in the 2010 U.S. Census.
Multiplying these frequencies against the U.S. population of ~343 million gives 345 estimated people. This assumes first names and last names are statistically independent. Full methodology.
Other people named Cassidy
Other people with the surname Williams
Cassidy Williams: Questions and Answers
How many people are named Cassidy Williams?
We estimate approximately 345 people named Cassidy Williams are alive in the United States today. The first name Cassidy is shared by 62,566 Americans, and the surname Williams is shared by 1,850,671.
How rare is the name Cassidy Williams?
This name combination is classified as Uncommon, occurring at a rate of about 1 in 993,491 Americans. The first name Cassidy is uncommon and the surname Williams is very common.
Is Cassidy a male or female name?
Cassidy is predominantly female, with 5.8% of bearers being male and 94.2% female. It peaked in popularity in 1999 and the average bearer today is 24 years old.
Where does this data come from?
First name data comes from the Social Security Administration (1880 to 2024), adjusted for survival using CDC 2023 life tables. Surname data comes from the 2010 U.S. Census Bureau. Full methodology.
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