Isaac vs Tiernan

Isaac and Tiernancompared 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.

Northern Ireland · Boys
In 2024, Isaac was ranked #26 and Tiernan #125 among boys in Northern Ireland.
England and Wales · Boys
In 2024, Isaac was ranked #37 and Tiernan #2921 among boys in England and Wales.
Scotland · Boys
In 2024, Isaac was ranked #49 and Tiernan #619 among boys in Scotland.
Republic of Ireland · Boys
In 2025, Isaac was ranked #104 and Tiernan #115 among boys in Republic of Ireland.

Isaac and Tiernan over time

Isaac and Tiernan appear together in 3 published lists, across 94 years of shared records. Isaac held the stronger position in more years in 3 of them, Tiernan 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.

Tiernan reached its own highest recorded position earlier in 2 of those lists, Isaac in 1. 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 moved ahead of the other
In 2009, Isaac moved ahead of Tiernan in Northern Ireland · Boys — #71 and #52 the year before became #62 and #76.
Repeatedly exchanged positions
Isaac and Tiernan changed places 9 times in Republic of Ireland · Boys between 1964 and 2025, ending at #104 and #115.
Closest over the longest run
Across 37 shared years in Republic of Ireland · Boys, Isaac and Tiernan averaged 31.4 places apart, ending at #104 and #115.
Longest-running competitions
Isaac and Tiernan were both ranked in Republic of Ireland · Boys for 37 years, from 1964 to 2025, ending at #104 and #115.

List by list

Republic of Ireland · Boys37 shared years, 1964–2025
Isaac held the stronger position in 22 of those years, Tiernan in 13.
Highest recorded here: Isaac #77 in 2014, Tiernan #84 in 2022.
The order changed in 2023: Isaac moved ahead. In 2022 they stood at #100 and #84; by 2023 that had become #83 and #115.
Most recent shared year, 2025: Isaac #104, Tiernan #115.
England and Wales · Boys29 shared years, 1996–2024
Isaac held the stronger position in 29 of those years, Tiernan in 0.
Highest recorded here: Isaac #20 in 2015, Tiernan #697 in 1999.
The order between them never changed and held in this list.
Most recent shared year, 2024: Isaac #37, Tiernan #2921.
Northern Ireland · Boys28 shared years, 1997–2024
Isaac held the stronger position in 16 of those years, Tiernan in 12.
Highest recorded here: Isaac #20 in 2020, Tiernan #52 in 2008.
The order changed in 2009: Isaac moved ahead. In 2008 they stood at #71 and #52; by 2009 that had become #62 and #76.
Most recent shared year, 2024: Isaac #26, Tiernan #125.

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.

Where to go next

Comparisons that share a name, a rule or a published list with this one. Each is an existing comparison page with its own evidence — nothing here says these pairs are alike.

Other comparisons involving Isaac

Pairs where Isaac shares a published list with another name, each measured inside one registrar's own list.

Isaac vs Tom
In 1996 they stood at #104 and #102 in England and Wales · Boys, 2 places apart; by 2024 they were #37 and #757.
Isaac · Tom · 29 shared years, 1996–2024 · Started together, ended far apart
See the 2024 England and Wales ranking
George vs Isaac
George and Isaac changed places 14 times in New Zealand · Boys between 1981 and 2023, ending at #7 and #46.
George · Isaac · 42 shared years, 1981–2023 · Repeatedly exchanged positions
See the 2023 New Zealand ranking
Elijah vs Isaac
Elijah and Isaac both rose over the same years in 4 registrars — England and Wales · Boys; New South Wales, Australia · Boys; Northern Ireland · Boys; Republic of Ireland · Boys. Each list is measured against its own starting position; the positions are never combined.
Elijah · Isaac · 30 shared years, 1996–2025 · Moved together in several countries
Jack vs Isaac
Jack and Isaac both rose over the same years in 4 registrars — New South Wales, Australia · Boys; New Zealand · Boys; Northern Ireland · Boys; Republic of Ireland · Boys. Each list is measured against its own starting position; the positions are never combined.
Jack · Isaac · 39 shared years, 1976–2025 · Moved together in several countries

Side by side

Side-by-side comparison of Isaac, Tiernan
Field	Isaac	Tiernan
Record type	Editorially researched profile	Official statistical record (evidence-only)
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.	Not yet recorded
Origin	Biblical Hebrew, transmitted into English via Greek Isaak and Late Latin Isaac	Not yet recorded
Pronunciation	/ˈaɪzək/	Not yet recorded
Syllables	2	2
Common variants / nicknames	Not yet recorded	Not yet recorded
Recorded regional usage	AU-NSW, GB-ENW, GB-NIR, GB-SCT, IE, NO, NZ	GB-ENW, GB-NIR, GB-SCT, IE
Most recent popularity observation	New South Wales, Australia · Boys #26 (2025)	Republic of Ireland · Boys #115 (2025)
Pronunciation clarity (demonstration score)	90/100	Not yet recorded
Spelling simplicity (demonstration score)	94/100	82/100
International familiarity (demonstration score)	100/100	100/100
Data Confidence	medium	medium

What the data shows

Isaac has a recorded origin (Biblical Hebrew, transmitted into English via Greek Isaak and Late Latin Isaac); Tiernan does not have one recorded yet.
Isaac and Tiernan both have 2 syllables.
A meaning is recorded for Isaac; Tiernan doesn't have one written yet.
Both names have recorded usage in GB-ENW, GB-NIR, GB-SCT, IE.

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

Tiernan

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 recorded1997–2024
Highest recorded position: #52 among boys in Northern Ireland, in 2008 (recorded 1997–2024).
Northern Ireland · Boys
Most recent2025
Most recently recorded at #115 among boys in Republic of Ireland, in 2025.
Republic of Ireland · Boys