Lachlan vs Sean
Lachlan and Seancompared on official birth-registration statistics and Namewise's recorded data. This page states what each name's record shows — it never picks a winner or scores one name against the other.
Head to head
Ranks are only compared within one published list and one year. Two ranks from different years, from a boys' and a girls' list, or from different registrars are not comparable, so they are not placed side by side.
New South Wales, Australia · Boys
In 2007, Lachlan was ranked #4 and Sean #85 among boys in New South Wales, Australia.
New Zealand · Boys
In 2007, Lachlan was ranked #26 and Sean #83 among boys in New Zealand.
Northern Ireland · Boys
In 2024, Lachlan was ranked #278 and Sean #48 among boys in Northern Ireland.
Scotland · Boys
In 2024, Lachlan was ranked #88 and Sean #234 among boys in Scotland.
Republic of Ireland · Boys
In 2025, Lachlan was ranked #317 and Sean #141 among boys in Republic of Ireland.
England and Wales · Boys
In 2024, Lachlan was ranked #328 and Sean #638 among boys in England and Wales.
Lachlan and Sean over time
Lachlan and Sean appear together in 5 published lists, across 97 years of shared records. Sean held the stronger position in more years in 3 of them, Lachlan in 2.
The order between them changed and held in 3 of those lists — a change in that published list, never a claim that one name displaced the other.
Sean reached its own highest recorded position earlier in 5 of those lists, and Lachlan in none. Each position is a place inside its own list, so this compares when they peaked and never how high.
Counted list by list. Two names in the same published list are measured on the same scale in the same year, so those comparisons are real — but positions from different lists are not, so nothing here is combined into an overall standing.
How this pair is related
The relationship kinds these two qualify for, each under its own stated rule. Every one is drawn from a list they both appear in.
- One took the other's place near the top
In New Zealand · Boys, Lachlan moved into the top 50 at #36 in 2000 as Sean fell out of it to #52, having been #31 the year before.
- One moved ahead of the other
In 1991, Lachlan moved ahead of Sean in New South Wales, Australia · Boys — #50 and #42 the year before became #45 and #50.
- Closest over the longest run
Across 24 shared years in New South Wales, Australia · Boys, Lachlan and Sean averaged 38.2 places apart, ending at #4 and #85.
List by list
England and Wales · Boys29 shared years, 1996–2024
Lachlan held the stronger position in 6 of those years, Sean in 23.
Highest recorded here: Lachlan #328 in 2024, Sean #49 in 1996.
The order changed in 2020: Lachlan moved ahead. In 2019 they stood at #454 and #404; by 2020 that had become #347 and #509.
Most recent shared year, 2024: Lachlan #328, Sean #638.
New South Wales, Australia · Boys24 shared years, 1982–2007
Lachlan held the stronger position in 16 of those years, Sean in 8.
Highest recorded here: Lachlan #2 in 2005, Sean #42 in 1990.
The order changed in 1991: Lachlan moved ahead. In 1990 they stood at #50 and #42; by 1991 that had become #45 and #50.
Most recent shared year, 2007: Lachlan #4, Sean #85.
Republic of Ireland · Boys24 shared years, 1997–2025
Lachlan held the stronger position in 0 of those years, Sean in 24.
Highest recorded here: Lachlan #263 in 2016, Sean #1 in 1997.
The order between them never changed and held in this list.
Most recent shared year, 2025: Lachlan #317, Sean #141.
New Zealand · Boys10 shared years, 1997–2007
Lachlan held the stronger position in 8 of those years, Sean in 2.
Highest recorded here: Lachlan #26 in 2007, Sean #31 in 1999.
The order changed in 2000: Lachlan moved ahead. In 1999 they stood at #46 and #31; by 2000 that had become #36 and #52.
Most recent shared year, 2007: Lachlan #26, Sean #83.
Northern Ireland · Boys10 shared years, 1998–2024
Lachlan held the stronger position in 0 of those years, Sean in 10.
Highest recorded here: Lachlan #226 in 2021, Sean #16 in 1998.
The order between them never changed and held in this list.
Most recent shared year, 2024: Lachlan #278, Sean #48.
Two names moving past each other in a ranking is a fact about the ranking. Namewise does not claim one name displaced the other, that families chose between them, or that either influenced the other — none of that is in this data.
Side by side
| Field | Lachlan | Sean |
|---|---|---|
| Record type | Editorially researched profile | Editorially researched profile |
| Gender usage | male | male |
| Meaning | Traditionally understood as 'Viking' or 'Scandinavian' via its root name — someone associated with the land of the Norsemen. A secondary reading of that root gives 'land of the lakes'. | The Irish form of John, ultimately carrying the meaning 'Yahweh is gracious' via its Hebrew ancestry. |
| Origin | Scottish Gaelic (Anglicised), from Lochlann ('Scandinavia') | Irish, Anglicised form of Sean, via Hebrew John |
| Pronunciation | /ˈlɒklən/ | /ʃɔːn/ |
| Syllables | 2 | 1 |
| Common variants / nicknames | Not yet recorded | Not yet recorded |
| Recorded regional usage | AU-NSW, GB-ENW, GB-NIR, GB-SCT, IE, NZ | AU-NSW, GB-ENW, GB-NIR, GB-SCT, IE, NO, NZ |
| Most recent popularity observation | New South Wales, Australia · Boys #34 (2025) | Republic of Ireland · Boys #141 (2025) |
| Pronunciation clarity (demonstration score) | 90/100 | 90/100 |
| Spelling simplicity (demonstration score) | 82/100 | 95/100 |
| International familiarity (demonstration score) | 100/100 | 100/100 |
| Data Confidence | medium | medium |
What the data shows
- Lachlan is recorded with a Scottish Gaelic (Anglicised), from Lochlann ('Scandinavia') origin, while Sean is recorded with a Irish, Anglicised form of Sean, via Hebrew John origin.
- Lachlan has 2 syllables, compared with 1 for Sean.
- Lachlan's recorded meaning differs from Sean's — see the table above for each.
- Both names have recorded usage in AU-NSW, GB-ENW, GB-NIR, GB-SCT, IE, NZ.
How each name got here
Lachlan
Popularity journey
First recorded1982
First recorded at #95 among boys in New South Wales, Australia in 1982 — the earliest year that source publishes this name, not necessarily the earliest it was used.
New South Wales, Australia · Boys
Highest recorded1982–2025
Highest recorded position: #2 among boys in New South Wales, Australia, in 2005 (recorded 1982–2025).
New South Wales, Australia · Boys
Most recent2025
Most recently recorded at #34 among boys in New South Wales, Australia, in 2025.
New South Wales, Australia · Boys
Sean
Popularity journey
First recorded1963
First recorded at #82 among boys in New South Wales, Australia in 1963 — the earliest year that source publishes this name, not necessarily the earliest it was used.
New South Wales, Australia · Boys
Highest recorded1964–2025
Highest recorded position: #1 among boys in Republic of Ireland, in 1997 (recorded 1964–2025).
Republic of Ireland · Boys
Most recent2025
Most recently recorded at #141 among boys in Republic of Ireland, in 2025.
Republic of Ireland · Boys