Boys name · Illinois
Theodore in Illinois
Theodore was the 4th most popular boys name in Illinois in 2025, with 537 babies named Theodore that year. Since 1910, Illinois families have named 17,801 babies Theodore.
Popularity over time
Theodore in Illinois, year by year
| Year | Babies | State rank |
|---|---|---|
| 1910 | 38 | 49th |
| 1926 | 247 | 45th |
| 1943 | 149 | 82nd |
| 1959 | 147 | 133rd |
| 1976 | 96 | 135th |
| 1992 | 59 | 241st |
| 2009 | 63 | 229th |
| 2025 | 537 | 4th |
Its rank among boys names in Illinois climbed from 49th in 1910 to 4th in 2025.
The most babies named Theodore in Illinois in a single year was 537, in 2025. Its best showing was 4th among boys names in 2023.
Across the country, Theodore reached its best rank of #1 in Michigan (2025). See Theodore in every state →
How popular is Theodore in Illinois?
Theodore was the 4th most popular boys name in Illinois in 2025, with 537 babies named Theodore that year. Since 1910, Illinois families have named 17,801 babies Theodore.
How many babies are named Theodore in Illinois?
In 2025, 537 babies were named Theodore in Illinois. The most babies named Theodore in Illinois in a single year was 537, in 2025.
What is the rank of Theodore in Illinois?
Theodore ranked 4th among boys names in Illinois in 2025. Its best showing was 4th among boys names in 2023.
Source: U.S. Social Security Administration, names by state of birth (public domain). Counts below 5 in a state-year are omitted by the SSA for privacy.