Dillan
How to say it: DIL-un · /ˈdɪlən/
Spelling variant of Dylan; from Welsh meaning 'great tide' or 'son of the sea'.
Dillan was the 41st most popular boys’ name in the United States in 2025, given to 28 babies (Social Security Administration). Its busiest decade was the 1990s, its births are down about 40% in ten years, and it is projected to slip to #58 by 2030.
Updated · SSA 2025 data, published May 2026 · Insee 2025 data, published July 2026 · How we compute these figures
Key facts
| Rank among boys’ names, 2025 | #41 |
|---|---|
| Babies born in 2025 | 28 |
| Share of births | 1 in 487 |
| Peak decade | 1990s |
| Change over 10 years | −40% |
| Projected rank for 2030 (estimate) | #58 |
| In France, 2025 | #300 among boys’ names, 0 births |
Sources: Social Security Administration (SSA), Insee (France). How we compute these figures.
Its life, decade by decade
Dillan is a newcomer: almost all of its history is from the last forty years.
What goes with it
Nicknames
- Dill
- Dilly
Honouring a Dillan in the family
In the classroom
In a class of 25 children born in 2025, the chance that another child is called Dillan is about 1 in 21.
Around the world
This spelling is used in English, Irish, Welsh.
In France: #300 for boys in 2025.
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