Dillan
Dillan was the 3871st most popular name for boys in 2025, given to 28 babies. Its best year was 1992, when it ranked 553rd with 341 babies. Over the last ten years it has moved down 2,432 places. More babies were named Dillan in the 2000s than in any other decade.
Meaning (as Dylan) Origin uncertain · Welsh
- Rank in 2025
- #3,871 boys, down 1,429 places since 2020
- Babies in 2025
- 28boys
- Girls and boys
- 20% girls, 80% boys2021–2025
- Peak year
- 1992341 babies
- Total since 1880
- 7,387babies recorded
What does the name Dillan mean?
Dillan is a spelling of Dylan, pronounced the same way, so it shares Dylan's meaning and origin.
Dylan comes from Welsh legend: Dylan ail Don is a sea-linked figure in the fourth branch of the Mabinogi. The meaning is uncertain. 'Son of the sea' and 'great tide' are often given, but Wiktionary marks the Celtic derivation as only possible. Wiktionary also notes that Dylan is unrelated to the Irish surname Dillon despite the shared sound.
Dylan (Middle Welsh, “character in the Mabinogi”)
How sure is this? Uncertain. The meaning is not established. Wikipedia derives the name from Welsh dy 'great' + llanw 'tide', citing the Geiriadur Prifysgol Cymru; Wiktionary treats the Celtic derivation as only possible.
See also: Welsh names.
Dillan popularity since 1880
| Year | Rank (girls) | Rank (boys) | Babies (girls) | Babies (boys) |
|---|---|---|---|---|
| 2025 | #10,312 | #3,871 | 9 | 28 |
| 2020 | #8,536 | #2,442 | 12 | 53 |
| 2010 | #5,665 | #985 | 24 | 200 |
| 2000 | — | #673 | — | 265 |
| 1990 | — | #1,227 | — | 80 |
| 1980 | — | #6,505 | — | 5 |
| 1970 | — | — | — | — |
| 1960 | — | — | — | — |
| 1950 | — | — | — | — |
| 1940 | — | — | — | — |
| 1930 | — | — | — | — |
| 1920 | — | — | — | — |
| 1910 | — | — | — | — |
| 1900 | — | — | — | — |
| 1890 | — | — | — | — |
| 1880 | — | — | — | — |
How popular is Dillan, counting every spelling?
Dillan is a spelling of Dylan, a name family that ranked #40 for boys in 2025 once every spelling is counted together, compared with #3,871 for Dillan on its own. Together these spellings went to 6,834 boys in 2025.
| Spelling | Babies 2025 | Official rank | Babies 2021–2025 |
|---|---|---|---|
| Dylan | 6,208 | #41 | 34,281 |
| Dilan | 309 | #805 | 1,635 |
| Dillon | 253 | #930 | 1,632 |
| Dillan | 28 | #3,871 | 227 |
| Dyllan | 11 | #7,321 | 90 |
| Dylon | 11 | #7,322 | 90 |
| Dylen | 6 | #11,021 | 41 |
Spellings count together when they sound the same in American English and are used for the same sex; nicknames and forms that sound different (such as Theo and Theodore) are kept apart. How we group spellings.
How many kids will share the name Dillan?
28 of the 3,606,400 babies born in the US in 2025 were named Dillan (0.01 per 1,000 births). For a boy named Dillan born in 2025, the chance that another child with the same name is in a class of 20 children the same age is under 1 in 50. If every grade liked the name as much as the 2025 babies do, only about one elementary school in 298 (of 430 pupils) would have a child named Dillan.
Shares of all registered births (NCHS); classes assumed to be children born the same year. How we estimate this.
How old are people named Dillan?
About 6,800 people born in the US named Dillan are alive today, with a median age of 24; half are between 17 and 30. That makes Dillan mostly worn by children and young adults.
Babies given the name each year (SSA) times the share of that birth year still alive (SSA life tables). Counts people born in the US only. Method.
Dillan by state
How common Dillan was among boys born in each state in 2021–2025. In 48 states fewer than five boys a year got the name, too few for SSA to publish, so those states show as zero.
Names with a similar history
These names rose and fell in step with Dillan: their share of US boys followed the most similar curve since 1880. If you like Dillan, they share its era and feel.
Questions about the name Dillan
What does Dillan mean?
The origin of Dylan is uncertain: the meaning is not established. Wikipedia derives the name from Welsh dy 'great' + llanw 'tide', citing the Geiriadur Prifysgol Cymru; Wiktionary treats the Celtic derivation as only possible.
How popular is the name Dillan?
Dillan was the 3871st most popular name for boys in 2025, given to 28 babies. Its best year was 1992, when it ranked 553rd with 341 babies. Over the last ten years it has moved down 2,432 places. More babies were named Dillan in the 2000s than in any other decade.
Is Dillan a boy or girl name?
In 2021–2025, 20% girls, 80% boys given the name Dillan in the US.
Where is Dillan most popular?
In 2021–2025, Dillan was most common in Florida (0.02 per 1,000 boys), followed by Texas and California.