Gillian Armstrong
There are approximately 7 people named Gillian Armstrong living in the United States today. That makes this name combination very rare, occurring at a rate of about 1 in 48,964,905 Americans.
This estimate combines SSA birth records for the first name Gillian with Census Bureau frequency data for the surname Armstrong. Below you will find a breakdown of both names, including popularity trends, gender data, and ancestry information.
Expected bearers
7
1 in 48,964,905
Named Gillian
15K
Alive today
Named Armstrong
157K
Alive today
US population
343M
Denominator
Estimated living: 15K
Rarity: Uncommon
Gender: Female
Peak year: 1999
Average age: 31
Estimated bearers: 157K
Rarity: Common
Census rank: #213
Per 100K: 45.78
Top ancestry: White (72.4%)
First name trend
Gillian: popularity over time
Year-by-year SSA birth registrations for the first name Gillian. The peak year was 1999 with 1,030 births. The average person named Gillian today is 31 years old.
Babies born per year
Ethnicity
Ancestry of the Armstrong surname
Self-reported race and ethnicity breakdown for people with the surname Armstrong, from the 2010 US Census Bureau. The largest group is White at 72.4%.
- White72.4%
- Black or African American21.0%
- Hispanic or Latino2.8%
- Two or more races2.3%
- American Indian and Alaska Native0.9%
- Asian and Pacific Islander0.6%
Methodology
How we calculated this
The first name Gillian has a living-bearer frequency of 0.0045% of the US population, based on 15,315 estimated living Americans carrying this first name (from SSA birth records going back to 1880, adjusted for mortality using CDC life tables).
The surname Armstrong appears at a rate of 45.78 per 100,000 residents in the 2010 Census Bureau surname file, which translates to a frequency of 0.0458%.
Multiplying these two independent frequencies against the current US population of 342,754,338 gives an expected count of approximately 7 people with the full name Gillian Armstrong. This assumes statistical independence between first and last names, which is a simplification but produces reasonable estimates for most combinations.
Related
Other people named Gillian
Related
Other people with the surname Armstrong
FAQ
Gillian Armstrong: questions and answers
How many people are named Gillian Armstrong?
We estimate approximately 7 people in the United States share the full name Gillian Armstrong. That works out to about 1 in 48,964,905 Americans. This is calculated by combining the first-name frequency (0.0045%) with the surname frequency (45.78 per 100K) against the current US population.
How rare is the name Gillian Armstrong?
We classify Gillian Armstrong as "Very Rare". About 1 in 48,964,905 Americans share this exact first and last name combination.
Is Gillian a male or female name?
Gillian is predominantly female. Out of 16,079 total SSA registrations, 0.4% were male and 99.6% were female. See the full Gillian 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 2010 US Census Bureau decennial surname tables. Living-bearer estimates use CDC actuarial life tables to adjust for mortality. Read the full methodology.