Mark Illsley
There are approximately 1 people named Mark Illsley 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 Mark with Census Bureau frequency data for the surname Illsley. Below you will find a breakdown of both names, including popularity trends, gender data, and ancestry information.
Expected bearers
1
1 in 342,754,338
Named Mark
1.1M
Alive today
Named Illsley
343
Alive today
US population
343M
Denominator
Estimated living: 1.1M
Rarity: Very Common
Gender: Male
Peak year: 1960
Average age: 56
Estimated bearers: 343
Rarity: Very Rare
Census rank: #69,579
Per 100K: 0.10
Top ancestry: White (93.3%)
First name trend
Mark: popularity over time
Year-by-year SSA birth registrations for the first name Mark. The peak year was 1960 with 58,852 births. The average person named Mark today is 56 years old.
Babies born per year
Ethnicity
Ancestry of the Illsley surname
Self-reported race and ethnicity breakdown for people with the surname Illsley, from the 2010 US Census Bureau. The largest group is White at 93.3%.
- White93.3%
- Hispanic or Latino6.0%
Methodology
How we calculated this
The first name Mark has a living-bearer frequency of 0.3339% of the US population, based on 1,144,344 estimated living Americans carrying this first name (from SSA birth records going back to 1880, adjusted for mortality using CDC life tables).
The surname Illsley appears at a rate of 0.10 per 100,000 residents in the 2010 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 Mark Illsley. This assumes statistical independence between first and last names, which is a simplification but produces reasonable estimates for most combinations.
Related
Other people named Mark
FAQ
Mark Illsley: questions and answers
How many people are named Mark Illsley?
We estimate approximately 1 people in the United States share the full name Mark Illsley. That works out to about 1 in 342,754,338 Americans. This is calculated by combining the first-name frequency (0.3339%) with the surname frequency (0.10 per 100K) against the current US population.
How rare is the name Mark Illsley?
We classify Mark Illsley as "Very Rare". About 1 in 342,754,338 Americans share this exact first and last name combination.
Is Mark a male or female name?
Mark is predominantly male. Out of 1,365,265 total SSA registrations, 99.7% were male and 0.3% were female. See the full Mark 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.