Janusz Blazejewski
There are approximately 1 people named Janusz Blazejewski living in the United States today. That makes this name combination very rare, occurring at a rate of about 1 in 342,754,338 Americans.
This estimate combines SSA birth records for the first name Janusz with Census Bureau frequency data for the surname Blazejewski. Below you will find a breakdown of both names, including popularity trends, gender data, and Census demographics where available.
Expected bearers
1
1 in 342,754,338
Named Janusz
5
Alive today
Named Blazejewski
492
Alive today
US population
343M
Denominator
Estimated living: 5
Rarity: Very Rare
Gender: Male
Peak year: 1994
Average age: 31
Top Census group: White (98.6%)
Estimated bearers: 492
Rarity: Very Rare
Census rank: #52,263
Per 100K: 0.14
Top ancestry: White (93.9%)
First name trend
Janusz: popularity over time
Year-by-year SSA birth registrations for the first name Janusz. The peak year was 1994 with 5 births. The average person named Janusz today is 31 years old.
Babies born per year
Demographics
Ancestry and ethnicity for Janusz
Self-reported race and ethnicity breakdown for people with the first name Janusz, from the 2020 US Census Bureau first-name tables. The largest published group is White at 98.6%.
The bar chart below shows how people with the first name Janusz described their own race and ethnicity on the 2020 Census form. These are self-reported numbers, and they describe the population who happened to carry the name Janusz at the time of the Census. A first name does not determine a person's race or ethnicity.
- White98.6% · 2,507
- Hispanic or Latino0.6% · 14
- Two or more races0.4% · 9
- Asian and Pacific Islander0.2% · 6
- American Indian and Alaska Native0.2% · 4
- Black or African American0.1% · 2
Ethnicity
Ancestry of the Blazejewski surname
Self-reported race and ethnicity breakdown for people with the surname Blazejewski, from the 2020 US Census Bureau. The largest group is White at 93.9%.
The bar chart below shows how people with the surname Blazejewski described their own race and ethnicity on the 2020 Census form. These are self-reported numbers, and they describe the population who happened to carry the surname Blazejewski at the time of the Census. A surname does not determine a person's race or ethnicity.
- White93.9% · 403
- Hispanic or Latino2.8% · 12
- Two or more races2.3% · 10
- Asian and Pacific Islander0.9% · 4
Methodology
How we calculated this
The first name Janusz has a living-bearer frequency of 0.0000% of the US population, based on 5 estimated living Americans carrying this first name (from SSA birth records going back to 1880, adjusted for mortality using CDC life tables).
Even though the Census Bureau now publishes first-name tables, we do not use that file as the main first-name input for this estimate. The latest first-name Census snapshot is from 2020, which makes it 6 years old today. Because Census first-name data is only released once every 10 years, SSA birth records plus CDC survival rates give a better current estimate of how many people are likely alive with the name Janusz right now.
The surname Blazejewski appears at a rate of 0.14 per 100,000 residents in the 2020 Census Bureau surname file, which translates to a frequency of 0.0001%.
Multiplying these two independent frequencies against the current US population of 342,754,338 gives an expected count of approximately 1 people with the full name Janusz Blazejewski. This assumes statistical independence between first and last names, which is a simplification but produces reasonable estimates for most combinations.
Related
Other people named Janusz
FAQ
Janusz Blazejewski: questions and answers
How many people are named Janusz Blazejewski?
We estimate approximately 1 people in the United States share the full name Janusz Blazejewski. That works out to about 1 in 342,754,338 Americans. This is calculated by combining the first-name frequency (0.0000%) with the surname frequency (0.14 per 100K) against the current US population.
How rare is the name Janusz Blazejewski?
We classify Janusz Blazejewski as "Very Rare". About 1 in 342,754,338 Americans share this exact first and last name combination.
Is Janusz a male or female name?
Janusz is predominantly male. Out of 5 total SSA registrations, 100.0% were male and 0.0% were female. See the full Janusz profile for detailed gender data.
Where does this data come from?
First-name data comes from the Social Security Administration's national baby name files (1880 to 2024). Surname data comes from the 2020 US Census Bureau decennial surname tables. Living-bearer estimates use CDC actuarial life tables to adjust for mortality. Read the full methodology.
How common is the name Janusz Blazejewski?
Find out how common the name Janusz Blazejewski is on our sister site HowManyOfMe.org — a quick modern estimate with the living-bearer count front and centre.