Sem Junior
There are approximately 1 people named Sem Junior 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 Sem with Census Bureau frequency data for the surname Junior. 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 Sem
211
Alive today
Named Junior
3.6K
Alive today
US population
343M
Denominator
Estimated living: 211
Rarity: Very Rare
Gender: Male
Peak year: 2006
Average age: 21
Top Census group: Hispanic or Latino (29.0%)
Estimated bearers: 3.6K
Rarity: Rare
Census rank: #9,871
Per 100K: 1.05
Top ancestry: Black (43.1%)
First name trend
Sem: popularity over time
Year-by-year SSA birth registrations for the first name Sem. The peak year was 2006 with 12 births. The average person named Sem today is 21 years old.
Babies born per year
Demographics
Ancestry and ethnicity for Sem
Self-reported race and ethnicity breakdown for people with the first name Sem, from the 2020 US Census Bureau first-name tables. The largest published group is Hispanic or Latino at 29.0%.
The bar chart below shows how people with the first name Sem 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 Sem at the time of the Census. A first name does not determine a person's race or ethnicity.
- Hispanic or Latino29.0% · 142
- Black or African American28.0% · 137
- Asian and Pacific Islander24.9% · 122
- White16.8% · 82
- Two or more races1.0% · 5
- American Indian and Alaska Native0.2% · 1
Ethnicity
Ancestry of the Junior surname
Self-reported race and ethnicity breakdown for people with the surname Junior, from the 2020 US Census Bureau. The largest group is Black at 43.1%.
The bar chart below shows how people with the surname Junior 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 Junior at the time of the Census. A surname does not determine a person's race or ethnicity.
- Black or African American43.1% · 1,347
- White36.2% · 1,132
- Hispanic or Latino13.9% · 433
- Two or more races3.5% · 110
- Asian and Pacific Islander2.4% · 76
- American Indian and Alaska Native0.9% · 28
Methodology
How we calculated this
The first name Sem has a living-bearer frequency of 0.0001% of the US population, based on 211 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 Sem right now.
The surname Junior appears at a rate of 1.05 per 100,000 residents in the 2020 Census Bureau surname file, which translates to a frequency of 0.0010%.
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 Sem Junior. This assumes statistical independence between first and last names, which is a simplification but produces reasonable estimates for most combinations.
Related
Other people named Sem
FAQ
Sem Junior: questions and answers
How many people are named Sem Junior?
We estimate approximately 1 people in the United States share the full name Sem Junior. That works out to about 1 in 342,754,338 Americans. This is calculated by combining the first-name frequency (0.0001%) with the surname frequency (1.05 per 100K) against the current US population.
How rare is the name Sem Junior?
We classify Sem Junior as "Very Rare". About 1 in 342,754,338 Americans share this exact first and last name combination.
Is Sem a male or female name?
Sem is predominantly male. Out of 214 total SSA registrations, 100.0% were male and 0.0% were female. See the full Sem 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 many people have the full name Sem Junior?
Our sister site HowManyOfMe.org answers how common the name Sem Junior is at a glance, with the living-bearer count up front.