Cillian
Boy name · #507 in 2025 · Uniqueness 26/100
In 2025, 595 baby boys were named Cillian, placing it at #507 in the official national rankings. A decade ago it stood at #1416, so the name has been rising over the past ten years. Roughly one in every 3,025 boys born in 2025 was named Cillian.
Babies named Cillian per year, 1880–2025. Source: SSA.
The 30-year story
Cillian first appears in the Social Security records in 1995, when 5 boys received the name. Its all-time peak is essentially right now: 2024, with 668 babies and a rank of #463. Names at their peak can keep climbing — or be one trend cycle from the long slide that eventually hits most popular names. Following the curve matters more than today's snapshot: a name's position on its rise-peak-decline arc is the best predictor of how common it will feel in a kindergarten class five years from now.
Unlock the 5-year forecast and compare Cillian against up to 5 other names.
Uniqueness: will there be another Cillian in class?
Cillian scores 26 out of 100 on our uniqueness scale, which blends current rarity with five-year momentum — putting it in the "popular" band. A low score means broad familiarity: teachers will spell it right, and your child may share it with a classmate. For many families that's a feature, not a bug.
Where Cillian is most common
Geography matters for names, and Cillian is no exception. In 2025 the states with the most Cillians were CA (60), NY (50), TX (35), OH (31), FL (29). Raw counts naturally favor populous states, but the spread still hints at where the name is part of the local naming culture.
Names like Cillian
Statistically, parents drawn to Cillian tend to be choosing among names with similar popularity arcs, era profiles, and sounds — the closest matches in our model are Caspian, Cassian, Lian, Kylian, and Bastian.
CaspianCassianLianKylianBastianLucianChosenKilian
Rank history (last 25 years)
| Year | Babies named Cillian | Rank |
|---|---|---|
| 2025 | 595 | #507 |
| 2024 | 668 | #463 |
| 2023 | 477 | #594 |
| 2022 | 353 | #735 |
| 2021 | 341 | #747 |
| 2020 | 228 | #957 |
| 2019 | 186 | #1078 |
| 2018 | 193 | #1052 |
| 2017 | 170 | #1126 |
| 2016 | 177 | #1105 |
| 2015 | 121 | #1416 |
| 2014 | 87 | #1730 |
| 2013 | 77 | #1851 |
| 2012 | 73 | #1942 |
| 2011 | 66 | #2035 |
| 2010 | 54 | #2354 |
| 2009 | 52 | #2451 |
| 2008 | 51 | #2467 |
| 2007 | 39 | #2974 |
| 2006 | 42 | #2744 |
| 2005 | 10 | #7096 |
| 2004 | 8 | #8143 |
| 2001 | 6 | #9243 |
| 1999 | 5 | #9912 |
| 1995 | 5 | #8868 |
Frequently asked questions
Is Cillian a popular boy name?
Cillian ranked #507 among boys in 2025 with 595 babies given the name — outside the top 500, making it an uncommon pick. Ten years earlier it ranked #1416.
When was the name Cillian most popular?
Cillian peaked in 2024, when 668 American boys received the name (ranked #463 that year). That peak is current — the name is at or near its all-time high right now.
How rare is the name Cillian?
In 2025, roughly 1 in 3,025 newborn American boys was named Cillian. It scores 26/100 on our uniqueness scale (rarity blended with momentum), which we classify as "popular".
Data source: U.S. Social Security Administration name statistics, 1880–2025, national and state files. Counts reflect Social Security card applications; names with fewer than 5 occurrences in a state-year are suppressed by the SSA.