Cillian Boy

Popularity: #416 · Trend: ↗ Rising

Name Meaning & Origin Pronunciation: KIL-ee-an /ˈkɪl.jən/

Origin: Irish; Gaelic

Meaning: Irish: slender; Gaelic: war; strife

Historical & Cultural Background

The name Cillian has its roots in the Irish language, derived from the Gaelic name "Cillín," which is a diminutive form of "cill," meaning "church" or "cell." The earliest forms of the name can be traced back to the early medieval period in Ireland, where it was often associated with monastic communities. The name is thought to have been borne by Saint Cillian, a 7th-century missionary who is venerated in parts of Ireland and Germany, further solidifying its religious significance.

Historically, Cillian gained prominence through its association with various saints and ecclesiastical figures. Saint Cillian, who was martyred in Würzburg, Germany, around 689 AD, played a crucial role in the spread of Christianity in the region.

His legacy contributed to the name's enduring presence in Irish culture, where it has been used for centuries. The name also appears in various historical texts and hagiographies, reflecting its importance in the ecclesiastical history of Ireland.

Cillian carries cultural resonance as a name linked to spirituality and community, often evoking images of monastic life and devotion. The name's association with churches and religious institutions has allowed it to maintain a sense of tradition and reverence throughout the centuries.

In addition to its primary form, the name has several variants and diminutives, such as "Killian," which have also been used historically, particularly in different regions of Ireland and beyond. This connection to both religious and cultural heritage has helped Cillian endure as a meaningful name within Irish history.

Famous people named Cillian

In this section, you will find notable people named Cillian. We include individuals across a wide range of fields, including actors known for their work in film, television, and stage productions. You'll also find musicians, directors, and other public figures named Cillian who have made a significant impact on popular culture.

We also feature individuals named Cillian who have made meaningful contributions to science, politics, athletics, literature, and other areas of public interest.

Please note that not every baby name in our database currently has a famous namesake listed. If you would like to suggest a name we may have missed or submit a correction, feel free to contact us. We review and finalize additions and corrections within 24 hours.

Cillian Murphy is an actor best known for Peaky Blinders, Inception, and 28 Days Later.

Cillian O'Connor is a Gaelic footballer best known for his performances with the Mayo senior team.

Sibling suggestions

If you're looking for sibling name ideas that pair well with Cillian, the following options are frequently chosen as complementary choices by parents.

U.S. Historical Usage

The name Cillian was first seen in the United States in 1995.

Cillian has ranked as high as #753 nationally, which occurred in 2024, and has been most popular in New York, California, Massachusetts, Texas, and Pennsylvania.

In the past 5 years the name Cillian has been trending up compared to the previous 5 years.

Popularity Over Time (National)

The name Cillian is part of our comprehensive baby names database, which includes Social Security Administration (SSA) data dating back to 1880—the first official year of state and national tracking. The chart below shows when Cillian was first recorded in the United States and illustrates how its popularity has risen and fallen over time.

Top States for Cillian (2024)

We track the most popular states for each baby name every year and highlight the locations where the name appears most frequently. In some cases, you may see four or five states listed. However, we only display states where the name represents a significant percentage of births, so the number of states shown can range from one to several.

State Births Share
NY 67
12%
CA 64
11%
PA 43
8%
FL 40
7%
MA 35
6%
TX 32
6%
IL 25
4%
VA 20
3%
TN 20
3%
WA 19
3%
NC 18
3%
MD 17
3%
AZ 15
3%
OH 15
3%
MI 14
2%

Popularity Over Time (National) — Table

We track the national popularity of each baby name annually. The table below displays each year along with the number of births reported by the Social Security Administration. This data combines all state-level reporting from the SSA's baby names database to provide a comprehensive view of overall birth counts for Cillian.

YearBirths
2024668
2023476
2022352
2021340
2020228
2019186
2018193
2017170
2016177
2015121
201487
201377
201273
201166
201054
200952
200851
200739
200642
200510
20048
20016
19995
19955