Cassidy vs Liam
How Cassidy and Liam compare across 146 years of US Social Security Administration baby-name records — popularity history, peak years, current rank, and which name overtook which.
US Popularity History — Side-by-Side
Annual US births named Cassidy (girls) vs Liam (boys), from US Social Security Administration national records.
Source: US Social Security Administration. Names appearing fewer than 5 times per year are suppressed by SSA.
Quick Stats
| Metric | Cassidy | Liam |
|---|---|---|
| Peak year (most US births) | 1999 — 3,395 girls | 2024 — 22,164 boys |
| Peak rank | #99 | #1 |
| Most recent rank (2025) | #541 (558 births) | #1 (20,818 births) |
| Total US births since 1880 | 39,704 | 343,615 |
| Last 10 years (2016–2025) | 7,759 | 202,429 |
Peak comparison takeaway
At its all-time peak, Liam reached 22,164 US births in 2024 — 18,769 more than Cassidy's peak count.
Crossover Years
Years where one name first passed the other in annual US births. A name "winning" in a year means it had more births that year, not necessarily a higher rank.
| Year | New leader | Cassidy births | Liam births |
|---|---|---|---|
| 2002 | Liam | 2,634 | 3,382 |
Strongest States — Last 10 Years
States where each name ranked highest, from SSA's state-level dataset. Lower average rank = name appears closer to the top of that state's girls-name list.
Cassidy — top 5 states
| # | State | Avg rank | Births |
|---|---|---|---|
| 1 | Delaware | #151 | 25 |
| 2 | Alaska | #162 | 15 |
| 3 | South Dakota | #204 | 16 |
| 4 | Pennsylvania | #248 | 442 |
| 5 | New Mexico | #256 | 36 |
Liam — top 5 states
| # | State | Avg rank | Births |
|---|---|---|---|
| 1 | Nevada | #1 | 1,758 |
| 2 | New Jersey | #1 | 6,079 |
| 3 | Florida | #1 | 14,195 |
| 4 | Oklahoma | #1 | 1,983 |
| 5 | New York | #1 | 12,930 |
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Data & methodology
Source: US Social Security Administration national baby names dataset 1880–2025 (CC0 public domain). Names with fewer than 5 occurrences in a given year are suppressed by SSA. State-level coverage runs 1910–2025. Crossover detection compares annual birth counts (not ranks) for each year both names appear. Methodology: see full notes. More comparisons →