How Many People Are Named Isiac?
An estimated 152 people in the United States have the first name Isiac. It is almost exclusively a male name. The average bearer is 26 years old, and Isiac peaked in popularity in 2001 with 15 births that year.
Below you will find a full statistical profile of Isiac as a first name in the United States, including gender data, a year-by-year popularity timeline going back to 1880, a decade breakdown, and state-by-state birth registrations. You can also check how many people share the full name Isiac paired with any surname.
Estimated Living Americans
152
About 1 in 2,254,963 people in the U.S.
Rarity
Very Rare
Predicted Gender
Male
100.0% confidence
Average Age
26
years old
Peak Year
2001
15 births
Total Registered
195
since 1880
Gender Distribution for Isiac
Isiac is almost exclusively a male name. Out of 195 total births registered, 100.0% were male.
Isiac as a male name
Ranked #10,081 in 2010
7 male births in 2010
Peak: 2001 (15 births)
Isiac: Popularity Over Time
SSA records for Isiac span from the 1910s to the 2010s, covering 8 decades of naming data. The most popular decade for this name was the 2000s, when 114 babies were registered. Isiac has declined significantly from its peak in the 2000s. Recent registrations are a fraction of what they were at the name's height.
Isiac by Decade
How has Isiac tracked across different eras? The table below groups all SSA birth registrations into 10-year periods, with separate male and female counts. The colored bar shows each decade's share relative to the peak.
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.
Names Similar to Isiac
Other first names starting with I with a similar number of bearers.
Isiac: Questions and Answers
How many people in the U.S. are named Isiac?
We estimate approximately 152 people named Isiac are alive in the United States today. This is based on SSA birth records from 1880 to 2024, adjusted for mortality using CDC life tables. About 1 in 2,254,963 Americans share this first name.
Is Isiac a common name?
Isiac is classified as "Very Rare" and is more popular than 70.5% of all first names in the SSA database. A total of 195 births have been registered with this name since 1880.
When was Isiac most popular?
Isiac reached peak popularity in 2001, when 15 babies were given this name. The average age of a living person named Isiac is approximately 26 years old, reflecting when the name was most commonly given.
Is Isiac a male name?
Isiac is predominantly male. 100.0% of people with this name are male. See the gender breakdown above for full details.
How many Isiac Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Isiac Smith, Isiac Johnson, Isiac Williams. You can also search any combination on our homepage.
Where does this data come from?
Our estimates use Social Security Administration birth records (1880 to 2024), adjusted for survival using CDC 2023 life tables broken down by sex. The U.S. population figure (342,754,338) is from the Census Bureau's July 2025 estimate. Full methodology.
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