How Many People Are Named Mary Williams?
Statistical full-name demographic model combining official Social Security & Census data
Under our demographic statistical model, an estimated ~2,070 living people in the United States share the full name Mary Williams.
Mary
Mary ranks as the #6 most common given name in U.S. Social Security history, with an estimated 376,103 living bearers nationwide.
Williams
Williams ranks as the #3 most frequent surname in official U.S. Census Bureau tabulations, representing 1,625,252 individuals across decennial returns.
How We Estimate Full-Name Frequency
Because privacy laws prevent the release of individualized master population rosters, statistical demographic models use the law of independent probabilities to estimate full-name frequencies:
1. First-Name Frequency: Based on historical SSA birth registrations adjusted by CDC life table actuarial survival rates.
2. Surname Frequency: Based on official U.S. Census Bureau decennial surname tabulations.
3. Mathematical Note: First and last names do not always distribute with complete independence across all ethnic sub-populations. This figure represents an evidence-grounded statistical estimate rather than an exact physical roll-call.
Related Full-Name Combinations
Explore demographic estimates for other combinations featuring Mary or Williams:
Frequently Asked Questions About Mary Williams
How many people in the U.S. have the full name Mary Williams?
Based on joint demographic modeling of Social Security and Census datasets, an estimated 2,070 living people in the United States share the full name Mary Williams.
Is this an exact count of living individuals named Mary Williams?
No. This is a statistical estimate calculated from independent first-name and surname distributions. The U.S. government does not publish a direct enumeration of identifiable full names for privacy reasons.
How is the Mary Williams full-name estimate calculated?
We calculate the joint probability of having the first name Mary (~376,103 living bearers) and the surname Williams (~1,625,252 Census occurrences) across the U.S. population under the statistical independence assumption.
What data sources are used?
Our model utilizes official U.S. Social Security Administration (SSA 1880–2024) birth applications, CDC/NCHS actuarial life tables for cohort survival, and U.S. Decennial Census surname frequency tabulations.
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