Isaac vs Liam
Isaac and Liamcompared 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.
Norway · Boys
In 2025, Isaac was ranked #251 and Liam #7 among boys in Norway.
Republic of Ireland · Boys
In 2025, Isaac was ranked #104 and Liam #7 among boys in Republic of Ireland.
New South Wales, Australia · Boys
In 2025, Isaac was ranked #26 and Liam #15 among boys in New South Wales, Australia.
New Zealand · Boys
In 2023, Isaac was ranked #46 and Liam #17 among boys in New Zealand.
Northern Ireland · Boys
In 2024, Isaac was ranked #26 and Liam #42 among boys in Northern Ireland.
England and Wales · Boys
In 2024, Isaac was ranked #37 and Liam #70 among boys in England and Wales.
Scotland · Boys
In 2024, Isaac was ranked #49 and Liam #47 among boys in Scotland.
Isaac and Liam over time
Isaac and Liam appear together in 6 published lists, across 200 years of shared records. Liam held the stronger position in more years in 6 of them, Isaac in 0.
The order between them changed and held in 2 of those lists — a change in that published list, never a claim that one name displaced the other.
Isaac reached its own highest recorded position earlier in 3 of those lists, Liam in 2. 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 Northern Ireland · Boys, Isaac moved into the top 50 at #37 in 2013 as Liam fell out of it to #76, having been #44 the year before.
- One moved ahead of the other
In 2011, Isaac moved ahead of Liam in England and Wales · Boys — #37 and #33 the year before became #33 and #44.
- Closest over the longest run
Across 29 shared years in England and Wales · Boys, Isaac and Liam averaged 44.6 places apart, ending at #37 and #70.
- Longest-running competitions
Isaac and Liam were both ranked in New South Wales, Australia · Boys for 35 years, from 1990 to 2025, ending at #26 and #15.
- Peaked in the same years
Both reached their highest recorded position in New Zealand · Boys within 2 years — Isaac #17 in 2010, Liam #1 in 2010.
List by list
New Zealand · Boys38 shared years, 1986–2023
Isaac held the stronger position in 0 of those years, Liam in 38.
Highest recorded here: Isaac #17 in 2010, Liam #1 in 2010.
The order between them never changed and held in this list.
Most recent shared year, 2023: Isaac #46, Liam #17.
Republic of Ireland · Boys38 shared years, 1964–2025
Isaac held the stronger position in 0 of those years, Liam in 38.
Highest recorded here: Isaac #77 in 2014, Liam #6 in 2021.
The order between them never changed and held in this list.
Most recent shared year, 2025: Isaac #104, Liam #7.
New South Wales, Australia · Boys35 shared years, 1990–2025
Isaac held the stronger position in 2 of those years, Liam in 33.
Highest recorded here: Isaac #8 in 2015, Liam #6 in 2020.
The order between them never changed and held in this list.
Most recent shared year, 2025: Isaac #26, Liam #15.
Norway · Boys32 shared years, 1990–2025
Isaac held the stronger position in 2 of those years, Liam in 30.
Highest recorded here: Isaac #164 in 2014, Liam #3 in 2015.
The order between them never changed and held in this list.
Most recent shared year, 2025: Isaac #251, Liam #7.
England and Wales · Boys29 shared years, 1996–2024
Isaac held the stronger position in 14 of those years, Liam in 15.
Highest recorded here: Isaac #20 in 2015, Liam #10 in 1996.
The order changed in 2011: Isaac moved ahead. In 2010 they stood at #37 and #33; by 2011 that had become #33 and #44.
Most recent shared year, 2024: Isaac #37, Liam #70.
Northern Ireland · Boys28 shared years, 1997–2024
Isaac held the stronger position in 13 of those years, Liam in 15.
Highest recorded here: Isaac #20 in 2020, Liam #35 in 2008.
The order changed in 2013: Isaac moved ahead. In 2012 they stood at #47 and #44; by 2013 that had become #37 and #76.
Most recent shared year, 2024: Isaac #26, Liam #42.
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 | Isaac | Liam |
|---|---|---|
| Record type | Editorially researched profile | Editorially researched profile |
| Gender usage | male | male |
| Meaning | Traditionally understood as 'he will laugh' or 'he laughs', tied to the biblical narrative in which Abraham and Sarah laugh at the prophecy of Isaac's birth in their old age. | A short form, inheriting its meaning from William — 'resolute protection' or 'will helmet'. |
| Origin | Biblical Hebrew, transmitted into English via Greek Isaak and Late Latin Isaac | Irish, short form of William (via Uilliam) |
| Pronunciation | /ˈaɪzək/ | /ˈliːəm/ |
| Syllables | 2 | 1 |
| Common variants / nicknames | Not yet recorded | Not yet recorded |
| Recorded regional usage | AU-NSW, GB-ENW, GB-NIR, GB-SCT, IE, NO, NZ | AU-NSW, GB-ENW, GB-NIR, GB-SCT, IE, NO, NZ |
| Most recent popularity observation | New South Wales, Australia · Boys #26 (2025) | Norway · Boys #7 (2025) |
| Pronunciation clarity (demonstration score) | 90/100 | 90/100 |
| Spelling simplicity (demonstration score) | 94/100 | 95/100 |
| International familiarity (demonstration score) | 100/100 | 100/100 |
| Data Confidence | medium | medium |
What the data shows
- Isaac is recorded with a Biblical Hebrew, transmitted into English via Greek Isaak and Late Latin Isaac origin, while Liam is recorded with a Irish, short form of William (via Uilliam) origin.
- Isaac has 2 syllables, compared with 1 for Liam.
- Isaac's recorded meaning differs from Liam's — see the table above for each.
- Both names have recorded usage in AU-NSW, GB-ENW, GB-NIR, GB-SCT, IE, NO, NZ.
How each name got here
Isaac
Popularity journey
First recorded1964
First recorded at #232 among boys in Republic of Ireland in 1964 — the earliest year that source publishes this name, not necessarily the earliest it was used.
Republic of Ireland · Boys
Highest recorded1990–2025
Highest recorded position: #8 among boys in New South Wales, Australia, in 2015 (recorded 1990–2025).
New South Wales, Australia · Boys
Most recent2025
Most recently recorded at #26 among boys in New South Wales, Australia, in 2025.
New South Wales, Australia · Boys
Liam
Popularity journey
First recorded1964
First recorded at #54 among boys in Republic of Ireland in 1964 — the earliest year that source publishes this name, not necessarily the earliest it was used.
Republic of Ireland · Boys
Highest recorded1986–2023
Highest recorded position: #1 among boys in New Zealand, in 2010 (recorded 1986–2023).
New Zealand · Boys
Most recent2025
Most recently recorded at #15 among boys in New South Wales, Australia, in 2025.
New South Wales, Australia · Boys