Kolby vs Liam
How Kolby 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 Kolby (boys) 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 | Kolby | Liam |
|---|---|---|
| Peak year (most US births) | 2001 — 739 boys | 2024 — 22,164 boys |
| Peak rank | #359 | #1 |
| Most recent rank (2016) | #950 (219 births) | #1 (20,818 births) |
| Total US births since 1880 | 6,779 | 343,615 |
| Last 10 years (2007–2016) | 3,200 | 202,429 |
Peak comparison takeaway
At its all-time peak, Liam reached 22,164 US births in 2024 — 21,425 more than Kolby's peak count.
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 boys-name list.
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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 →