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Dillan

#3,870 in 2025UnisexBoys' nameGirls' name

Variant of Dylan

Dillan has been given to 7,387 babies in the U.S. since 1975. In 2025 it ranked #3,870 of 13,926 boys’ names in use. Its peak year was 1992, with 341 recorded. It's used for both sexes: 95% boys, 5% girls all-time.

Babies named Dillan, 2025

1 in 118,000

Dillan over time, 1880–2025

BoysGirls
010020030040018801900192019401960198020002020

Based on births in the U.S. Babies given the name each year. Hover the chart — or focus it and use the arrow keys — for any year. Gaps mean the name was given fewer than 5 times that year; these counts are unpublished.

Girls or boys — Dillan over time

In 2025, Dillan went to 24% girls and 76% boys.

19752025

A sex is only published in years it reached five applications, so a stretch at 0% or 100% means the other side stayed under that floor — not that it was never used.

Dillan: meaning, origin, and history

Variant of Dylan

Deeper origin not confirmed in the cited records

What Dillan means

Dillan is a variant of Dylan.

Meaning behind the documented name family

The name developed through Dillan → Dylan. The family’s meaning is “to, toward + tide, flow”, recorded in the naming reference for Dylan.

Origin, language, and formation

Dillan is used in English.

Related names and everyday forms

Related names include Dylan.

American usage and historical context

In the United States, 6,994 boys were recorded with the name Dillan between 1975 and 2025. Its highest annual count was 341 in 1992; its best national rank was #553 in 1992.

Over 5 years its rank fell, from #2,441 in 2020 to #3,870 in 2025. Over 10 years its rank fell, from #1,439 in 2015 to #3,870 in 2025.

In the United States, 393 girls were recorded with the name Dillan between 1993 and 2025. Its highest annual count was 30 in 2003; its best national rank was #4,333 in 2003.

Over 5 years its rank fell, from #8,531 in 2020 to #10,308 in 2025. Over 10 years its rank rose, from #12,138 in 2015 to #10,308 in 2025.

Sources & methodologyReferences, data & attribution

Meaning, origin, and language notes draw on the references below.

American popularity figures use published Social Security Administration records for this exact spelling. Counts below five for a name, sex, and year are omitted.

Wiktionary material is available under CC BY-SA 4.0.

How common is Dillan?

Everything below is computed from the 2025 data — the most recent year available.

Among all babies, 2025
1 in 118,000
28 of 3,315,165 births
Among boys only
1 in 61,000
<0.01% of boys
Rank, 2025
#3,870
of 13,926 boys’ names in use
Coin-flip room size
82,069 kids
Even odds of a second one

Where Dillan sits on the popularity scale

Rarest published (5 a year)#1 — Liam (20,818)

Chance at least one other child shares the name

If the other children were drawn at random from the 2025 national name distribution. Real classrooms cluster by region and community, so treat these as a floor, not a ceiling.

Class of 20Under 1%
Class of 30Under 1%
Grade of 100Under 1%
School of 500Under 1%

Put another way: gather 82,069 children born in 2025 and it's an even bet that one of them is another Dillan. In a class of 30 the chance is Under 1%.

When Dillans were born

Half of everyone ever recorded as Dillan was born before 2002 — so the typical Dillan is around 23 today.

Median birth year
2002
About 23 years old
Biggest decade
2000s
38.6% of all use
Born in the last 25 years
56.1%
A modern name
Recorded since 1950
6,994
People you could plausibly meet
Choose a decade

2000s — 38.6% of all recorded uses (2,703).

Is Dillan rising or falling?

Rank movement and count movement can disagree — the number of distinct names in use keeps growing, so a name holding a steady count still slides down the list. Both are shown.

Rank vs 1 year ago
−986
Places dropped
Rank vs 5 years ago
−1,429
Places dropped
Rank vs 10 years ago
−2,431
Places dropped
Births vs 10 years ago
0.24×
Fewer babies than then
Share of its own peak
8.2%
Peak was 1992 (341)
Years since peak
33
Years
Year-to-year steadiness
Shifting
15.5% average annual change
Best rank ever
#553
1992

Spellings of Dillan

Dillan is not the most common spelling — Dylan is, with 50.2% against Dillan's 0.84%.

Grouped by closeness of spelling (up to two letter changes), same sex, with a floor on all-time use. It catches Sophia/Sofia and Aiden/Ayden, and misses spellings that sound alike but look different, like Sean and Shawn.

Where Dillan is used — boys

Across 2016–2025, Dillan was most concentrated in California — about 1 in 33,333 boys, against 1 in 49,756 across all states with data. It was least common in Virginia (1 in 100,000).

13 per 100,000

Most concentrated

  1. 1California1 in 33,333
  2. 2Texas1 in 33,333
  3. 3Georgia1 in 50,000
  4. 4Maryland1 in 50,000
  5. 5Florida1 in 100,000
  6. 6Illinois1 in 100,000
  7. 7Michigan1 in 100,000
  8. 8New York1 in 100,000

Shading is the share of that state's recorded boys given this name, not the raw count — otherwise the map would just show which states are biggest. Unshaded states have no published records for this period. U.S. birth records suppress state-year counts below 5; state counts therefore don't add up to the national total. Every state links to its full rankings.

Where Dillan is used — girls

Across 1910–2025, Dillan was most concentrated in California — about 1 in — girls, against 1 in 1,886,246 across all states with data. It was least common in Texas (1 in —).

00 per 100,000

Most concentrated

  1. 1California1 in —
  2. 2Texas1 in —

Shading is the share of that state's recorded girls given this name, not the raw count — otherwise the map would just show which states are biggest. Unshaded states have no published records for this period. U.S. birth records suppress state-year counts below 5; state counts therefore don't add up to the national total. Every state links to its full rankings. Dillan has too little recent state data to map, so this covers all years from 1910.

Dillan around the world

Where Dillan ranks in official birth records elsewhere in the world. Rankings only — the number of births isn’t comparable between places, so it isn’t shown.

  • England & Wales
    1996–2025
    #2,952
    in 2025
  • Scotland
    1994–2016
    #707
    in 2016
  • Northern Ireland
    2002–2014
    #398
    in 2014
  • Ireland
    1997–2015
    #699
    in 2015
  • France
    1992–2018
    #5,772
    in 2018
  • Canada
    1991–2016
    #2,748
    in 2016
  • South Australia
    1983–2012
    #771
    in 2012

Popularity data from Office for National Statistics, National Records of Scotland, Northern Ireland Statistics and Research Agency, Central Statistics Office, Institut national de la statistique et des études économiques, Statistics Canada and Consumer and Business Services (South Australia). ONS, NRS, NISRA data under Open Government Licence v3.0. CSO, CBS SA data under CC BY 4.0. INSEE data under Licence Ouverte / Etalab 2.0. StatCan data under Statistics Canada Open Licence.

Dillan by the numbers

The raw record for each sex the name is used for.

As a boy's name

Rank in 2025
#3,870
Trend vs 5 yrs ago
Down 1,429
Best rank ever
#553
1992
Peak year
1992
341 that year
First recorded
1975
Last recorded
2025
All-time count
6,994
Count in 2025
28

As a girl's name

Rank in 2025
#10,308
Trend vs 5 yrs ago
Down 1,777
Best rank ever
#4,333
2003
Peak year
2003
30 that year
First recorded
1993
Last recorded
2025
All-time count
393
Count in 2025
9

Names similar to Dillan

Matched on shared beginnings and endings, similar length, and comparable popularity.

DilanRaylanDillionJaylanKellanCallanKeelanDyllanLachlanDaylanDillonDeklanCaelanLochlanKylanTalanHarlanTylanDillardArlanKaelanKeilanWaylanBrylan

Names with a curve like Dillan

Not spelling — timing. These names rose, peaked and faded in the same years as Dillan, so they read as being from the same moment even when they look nothing alike.

DarionDevynZakaryDashawnDylonJavonteJaquanDarrionMarquezBrennenTyshawnDeven

Sibling names for Dillan

Names from the same era and popularity tier — the two things that make a sibling set feel deliberate — skipping lookalike spellings and shared initials.

Explore around Dillan

Top names of 1992, Dillan's peak yearThe 1990s in fullOther names that peaked in 1992Boys' names starting with D