The Illinois dataset covers 26,924 registered babies across 100 distinct first names, drawn from U.S. Social Security Administration records going back to 1910.
The #1 boy name Liam represents 4.9% of registered boys in the state. The #1 girl name Olivia represents 4.2% of girls. The higher those percentages, the more concentrated naming is — states with strong local traditions tend to cluster around familiar choices, while cosmopolitan states spread names over a wider pool.
Naming patterns in Illinois
The top names in Illinois broadly track the U.S. national trend — this state's favorites match what's popular across America without a strong regional accent.
Frequently asked questions
What is the most popular boy name in Illinois?
Liam is the most popular boy name in Illinois across the available data, recorded 737 times — about 4.9% of boys' name registrations in the state.
What is the most popular girl name in Illinois?
Olivia is the most popular girl name in Illinois, recorded 501 times — about 4.2% of girls' name registrations in the state.
How far back does the Illinois name data go?
The Illinois dataset spans 115 years of baby name records — from 1910 through 2025 — sourced directly from the U.S. Social Security Administration.
How many unique names have been used in Illinois?
The combined dataset for Illinois contains 100 distinct first names (50 boys, 50 girls) spanning 26,924 total registered births.