Isiac
Of Greek origin meaning "belonging to Isis", the Egyptian goddess.
Name Census estimates that about 152 living Americans carry the first name Isiac. The name is used almost exclusively for boys. The average person named Isiac today is around 26 years old, and the year with the single highest number of Isiac births was 2001 (15 babies).
This page is the full Name Census profile for Isiac. Below you will find a gender breakdown showing how the name splits between male and female registrations, a year-by-year popularity chart stretching back to 1880, decade-level totals, the top US states for this name, its meaning and etymology, and a set of frequently asked questions with data-backed answers.
People living today
152
~ 1 in 2,254,963 Americans
Peak year
2001
15 babies that year
Average age
26
years old
2010 SSA rank
#10,081
Tracked since 1912
Census
Isiac in the 2020 Census
The 2020 Census recorded 288 people with the first name Isiac, which placed it at #30,313 in the published first-name tables. This is a snapshot of people who already had the name at the time of the Census.
The SSA sections elsewhere on this page answer a different question: how often parents gave the name to babies over time. The "people living today" figure on this page is different again: it is a current estimate built from SSA birth records and age-based survival rates, so the two numbers are not expected to match exactly.
2020 Census rank
#30,313
National first-name rank
People counted
288
288 in the published race/origin table
Per 100,000
0.1
People with this name in 2020
Largest reported group
Hispanic or Latino
40.6% of people with this name
Demographics
Ancestry and ethnicity for Isiac
In the 2020 Census race and Hispanic-origin table, the largest reported group for people named Isiac is Hispanic at 40.6%. The next largest groups are White (36.5%) and Black (18.4%). These figures describe the people who had the name in 2020, not any inherent property of the name itself.
The bar chart below shows how people with the first name Isiac described their own race and ethnicity on the 2020 Census form. The Census Bureau groups responses into six broad categories: White, Black or African American, Hispanic or Latino, Asian and Pacific Islander, American Indian and Alaska Native, and Two or More Races. When a category has too few respondents for a given name, the Bureau suppresses the figure to protect individual privacy, which is why some names show fewer than six slices.
Percentages are shown so the breakdown is easy to read across every published category. Because the 2020 Census first-name file also includes raw headcounts for each group, Name Census can show those alongside the percentages in the legend and hover tooltip.
Keep in mind that these are self-reported numbers. A first name does not determine a person's race or ethnicity, and the distribution you see here reflects the specific population who happened to carry the name Isiac at the time of the 2020 Census, not any inherent property of the name itself.
- Hispanic or Latino40.6% · 117
- White36.5% · 105
- Black or African American18.4% · 53
- Two or more races3.8% · 11
- Asian and Pacific Islander0.3% · 1
- American Indian and Alaska Native0.3% · 1
Popularity
Isiac: popularity over time
The SSA tracks Isiac from the 1910s through to the 2010s, spanning 8 decades of birth certificate data. The biggest single decade for the name was the 2000s, with 114 total registrations. Usage has dropped considerably from its 2000s peak. The most recent decade brought in only a fraction of the registrations that the name once attracted.
Babies born per year
Decades
Isiac by decade
The table below breaks the full SSA timeline into ten-year windows. Each row shows how many male and female babies were given the name Isiac during that decade, along with a combined total. This is useful for spotting eras where the name surged or retreated.
Origin
Meaning and history of Isiac
The name Isiac has its origins in ancient Egyptian culture, dating back to the 3rd century BC. It is derived from the Greek word "Isiacus," which refers to the cult of the Egyptian goddess Isis. This name was given to followers of the Isis religion, which was prominent in the Greco-Roman world.
One of the earliest recorded examples of the name Isiac is found in the writings of the ancient Roman philosopher and historian, Plutarch. In his work "De Iside et Osiride" (On Isis and Osiris), he discusses the Isis cult and mentions the term "Isiacus" to refer to those involved in its rituals and practices.
During the Roman Empire, the Isis cult gained widespread popularity, and several individuals with the name Isiac are mentioned in various historical records and inscriptions. One notable figure was Isiac of Alexandria, a philosopher and alchemist who lived in the 3rd century AD. He is credited with writing several treatises on alchemy and the occult sciences.
In the 4th century AD, there was a Christian martyr named Isiac who was executed during the persecution of Christians under the Roman emperor Diocletian. His story is recorded in the early Christian martyrologies, although the details of his life are somewhat obscure.
Another prominent individual with the name Isiac was a 6th-century Byzantine scholar and commentator on Aristotle's works. He is known as Isiac the Philosopher and is believed to have lived in Constantinople during the reign of Justinian I.
In the Middle Ages, the name Isiac appeared in various religious and historical texts, although it was not as common as in ancient times. One notable figure was Isiac of Tyre, a 12th-century scholar and theologian who wrote several treatises on Christian theology and philosophy.
While the name Isiac has its roots in ancient Egyptian and Greek cultures, it has been used throughout history in various contexts. These examples highlight the enduring legacy of this name, which has been borne by philosophers, scholars, and individuals of historical significance over the centuries.
People
Isiac + last name combinations
How many people share a full name with Isiac as the first name? Click a combination below to see the estimate, or search any pairing.
Related
Other names starting with I
Other first names starting with I with a similar number of bearers.
FAQ
Isiac: questions and answers
How many people in the U.S. are named Isiac?
Name Census puts the figure at roughly 152 living Americans. We arrive at this by taking every SSA birth registration for Isiac going back to 1880 and adjusting each cohort for expected survival using CDC actuarial life tables. The result is an age-weighted living-bearer count, not a raw birth total. That works out to about 1 in 2,254,963 US residents.
Is Isiac a common name?
We classify Isiac as "Very Rare". It ranks above 70.5% of all first names in the SSA dataset by living bearers. Across the full history of the data, 195 babies have been registered with this name.
When was Isiac most popular?
The single biggest year for Isiac was 2001, when 15 babies received the name. The fact that the average living Isiac is about 26 years old gives you a rough sense of which era contributed the most bearers who are still alive today.
How common was Isiac in the 2020 Census?
The published 2020 Census first-name tables recorded 288 people with the name Isiac, or 0.10 per 100,000 residents. That placed it at #30,313 in the national Census ranking for first names.
Why is the Census count different from the living estimate?
Because they measure different things. The Census figure is a count of people who had the name Isiac in 2020. The living estimate aims to answer a current question instead: how many people with the name are alive today, based on SSA birth records and age-based survival rates. Since one number is a 2020 snapshot and the other is a present-day estimate, they are not expected to be identical.
What does the Census say about the gender split for Isiac?
In the 2020 Census sex table, Isiac appears almost entirely male. Of the 297 people counted with this name, 100.0% were male and only a very small share were female. The Census view is a snapshot of people living with the name in 2020, while the SSA section above tracks births across time.
What does the Census say about the background of people named Isiac?
In the 2020 Census race and Hispanic-origin table, the largest reported group for people named Isiac is Hispanic at 40.6%. The next largest groups are White (36.5%) and Black (18.4%). These figures describe the people who had the name in 2020, not any inherent property of the name itself. The percentages in the chart above come from self-reported race and Hispanic-origin responses in the 2020 Census.
Which group reports the name Isiac most often in the Census?
Hispanic is the largest reported group for people named Isiac in the 2020 Census, accounting for 40.6% (117 people in the published table).
Why can the Census sex total and race total differ slightly?
The Census Bureau published separate 2020 tables for sex and for race/Hispanic origin, and the released figures can differ slightly because of privacy protection in the public files. That is why this page treats the gender section and the race/origin section as two related snapshots instead of forcing them into one identical total.
Does every first name have Census demographic data?
No. The public Census first-name release only includes names that met the Bureau's publication rules, so many rarer names in the SSA files have no Census demographic snapshot. When that happens, the SSA trend, gender history, and state sections still appear, but the 2020 Census demographic sections are omitted.
What does the SSA popularity chart show?
The chart tracks births, not the number of people alive with the name today. Each point shows how many babies were given the name Isiac in that year. That makes it useful for spotting when the name rose, peaked, or faded.
Is Isiac a male name?
Yes, 100.0% of people registered as Isiac in the SSA data are male. You can see the full per-sex comparison in the gender distribution section above, which includes the latest year rank, birth count, and peak year for each sex.
Is Isiac still being used today?
Yes. The SSA still recorded Isiac in 2024, and the page above shows its latest-year rank where available. A name can be well past its peak and still remain in steady use, especially if it built up a large population over earlier decades.
Why can a name have a lot of living bearers even if it is not trendy now?
Because living-bearer counts and current baby-name popularity measure different things. A name like Isiac can build up a very large population over many decades, even if fewer parents are choosing it now than they did at its peak.
Where does this data come from?
First-name figures come from the Social Security Administration's national baby name files, which cover every name on a birth certificate from 1880 to 2024. Living-bearer estimates layer in CDC actuarial life tables broken out by sex to account for mortality. The population baseline (342,754,338) is the Census Bureau's latest national estimate. You can read the full calculation on our methodology page.
How many people are named Isiac?
Find out how many people have the name Isiac on our sister site HowManyOfMe.org — a quick modern estimate with the living-bearer count front and centre.