Cillian

Did you know?

A few things about Cillian you might not know, from US birth records and Wikipedia. Handy for convincing a partner, or a grandparent.

⭐ Famous Cillian

Cillian Murphy

Irish actor (born 1976)

Choose Cillian and your child shares a first name with Cillian Murphy, an Irish actor. A ready-made answer when someone asks “Cillian, like who?” Cillian Murphy's Wikipedia article is available in 89 languages, a good sign of just how widely known they are.

Read about Cillian Murphy on Wikipedia ↗ (opens in a new tab)

Photo: JoshPopov, CC BY 4.0 (opens in a new tab), via Wikimedia Commons

• 👶How commonAbout 1 in every 2,871 baby boys born in the US in 2025 was named Cillian, 595 babies in all. In a typical school of 500 kids, your Cillian would very likely be the only one.
• 📜HistoryCillian first shows up in US birth records in 1995, the first year at least 5 babies got it. It has been in use for 30 years since.
• 🏆Best yearIts best year was 2024, when it reached #463.
• 🚀TrendCillian has climbed 450 places in the US rankings over the last five years and now sits at #507. Fast risers like this often keep climbing, so expect to hear it more.
• 📍Where it's lovedCillian is most popular in Alaska, where it ranks #165, followed by Rhode Island (#200) and Delaware (#203). It's in the top 1,000 in 35 states.

About the name Cillian

Cillian is a boy name of Celtic, Gaelic and Irish origin. It has 7 letters and 2 syllables, starting with C and ending in “-ian”. US birth records list Cillian for boys from 1995 to 2025, in 25 of those 31 years. Its best year was 2024, when it ranked #463 among boy names. In 2025 it ranked #507, with 595 babies.

Origin:Celtic namesGaelic namesIrish names