Namewise

Isla vs Sadie

Isla and Sadiecompared 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.

  • Scotland · Girls

    In 2024, Isla was ranked #2 and Sadie #87 among girls in Scotland.

  • New Zealand · Girls

    In 2023, Isla was ranked #3 and Sadie #28 among girls in New Zealand.

  • England and Wales · Girls

    In 2025, Isla was ranked #4 and Sadie #134 among girls in England and Wales.

  • New South Wales, Australia · Girls

    In 2025, Isla was ranked #4 and Sadie #49 among girls in New South Wales, Australia.

  • Republic of Ireland · Girls

    In 2025, Isla was ranked #13 and Sadie #5 among girls in Republic of Ireland.

  • Northern Ireland · Girls

    In 2024, Isla was ranked #8 and Sadie #42 among girls in Northern Ireland.

Isla and Sadie over time

Isla and Sadie appear together in 4 published lists, across 81 years of shared records. Isla held the stronger position in more years in 3 of them, Sadie in 1.

The order between them changed and held in one of those lists — a change in that published list, never a claim that one name displaced the other.

Isla reached its own highest recorded position earlier in 3 of those lists, and Sadie 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 moved ahead of the other

    In 2005, Isla moved ahead of Sadie in England and Wales · Girls — #168 and #161 the year before became #125 and #173.

  • Repeatedly exchanged positions

    Isla and Sadie changed places 4 times in Republic of Ireland · Girls between 1979 and 2025, ending at #13 and #5.

  • Closest over the longest run

    Across 23 shared years in Republic of Ireland · Girls, Isla and Sadie averaged 45.7 places apart, ending at #13 and #5.

  • Longest-running competitions

    Isla and Sadie were both ranked in England and Wales · Girls for 30 years, from 1996 to 2025, ending at #4 and #134.

  • Peaked in the same years

    Both reached their highest recorded position in Northern Ireland · Girls within 2 years — Isla #1 in 2023, Sadie #22 in 2023.

List by list

  • England and Wales · Girls30 shared years, 1996–2025

    Isla held the stronger position in 21 of those years, Sadie in 9.

    Highest recorded here: Isla #3 in 2014, Sadie #129 in 2023.

    The order changed in 2005: Isla moved ahead. In 2004 they stood at #168 and #161; by 2005 that had become #125 and #173.

    Most recent shared year, 2025: Isla #4, Sadie #134.

  • Republic of Ireland · Girls23 shared years, 1979–2025

    Isla held the stronger position in 4 of those years, Sadie in 19.

    Highest recorded here: Isla #11 in 2023, Sadie #5 in 2025.

    The order between them never changed and held in this list.

    Most recent shared year, 2025: Isla #13, Sadie #5.

  • Northern Ireland · Girls19 shared years, 2005–2024

    Isla held the stronger position in 19 of those years, Sadie in 0.

    Highest recorded here: Isla #1 in 2023, Sadie #22 in 2023.

    The order between them never changed and held in this list.

    Most recent shared year, 2024: Isla #8, Sadie #42.

  • New Zealand · Girls9 shared years, 2014–2023

    Isla held the stronger position in 9 of those years, Sadie in 0.

    Highest recorded here: Isla #1 in 2020, Sadie #28 in 2023.

    The order between them never changed and held in this list.

    Most recent shared year, 2023: Isla #3, Sadie #28.

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 Isla

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

Other comparisons involving Sadie

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

Other pairs with the same kind of relationship

Pairs that qualify under the same rule as this one — peaked in the same years.

All peaked in the same years→

Other pairs from Northern Ireland lists

Pairs measured inside Northern Ireland's own published lists, where this pair's strongest relationship is also recorded. Positions in these lists are not comparable with another registrar's.

Northern Ireland overview→

Other pairs ranked together in the 2020s

Pairs both ranked in the same published list at some point between 2020 and 2029.

The 2020s across all registrars→

Side by side

Side-by-side comparison of Isla, Sadie
FieldIslaSadie
Record typeEditorially researched profileEditorially researched profile
Gender usagefemalefemale
MeaningA Scottish place name; not generally treated as having a separate lexical 'meaning' beyond the river/place it names.A diminutive form of the name Sarah.
OriginScottishBiblical Hebrew, diminutive form
Pronunciation/ˈaɪlə//ˈseɪ.di/
Syllables22
Common variants / nicknamesIslayNot yet recorded
Recorded regional usageAU-NSW, GB-ENW, GB-NIR, GB-SCT, IE, NZAU-NSW, GB-ENW, GB-NIR, GB-SCT, IE, NZ
Most recent popularity observationEngland and Wales · Girls #4 (2025)Republic of Ireland · Girls #5 (2025)
Pronunciation clarity (demonstration score)90/10090/100
Spelling simplicity (demonstration score)95/10094/100
International familiarity (demonstration score)100/100100/100
Data Confidencehighmedium

What the data shows

  • Isla is recorded with a Scottish origin, while Sadie is recorded with a Biblical Hebrew, diminutive form origin.
  • Isla and Sadie both have 2 syllables.
  • Isla's recorded meaning differs from Sadie's — see the table above for each.
  • Both names have recorded usage in AU-NSW, GB-ENW, GB-NIR, GB-SCT, IE, NZ.
  • The available evidence gives Isla a "high" Data Confidence level and Sadie a "medium" level — this reflects how complete and corroborated the underlying evidence is, not a judgement of either name.

How each name got here

Isla

Popularity journey

  1. First recorded1979

    First recorded at #467 among girls in Republic of Ireland in 1979 — the earliest year that source publishes this name, not necessarily the earliest it was used.

    Republic of Ireland · Girls

  2. Highest recorded2008–2025

    Highest recorded position: #1 among girls in New South Wales, Australia, in 2023 (recorded 2008–2025).

    New South Wales, Australia · Girls

  3. Most recent2025

    Most recently recorded at #4 among girls in England and Wales, in 2025.

    England and Wales · Girls

Sadie

Popularity journey

  1. First recorded1964

    First recorded at #372 among girls in Republic of Ireland in 1964 — the earliest year that source publishes this name, not necessarily the earliest it was used.

    Republic of Ireland · Girls

  2. Highest recorded1964–2025

    Highest recorded position: #5 among girls in Republic of Ireland, in 2025 (recorded 1964–2025).

    Republic of Ireland · Girls

  3. Most recent2025

    Most recently recorded at #134 among girls in England and Wales, in 2025.

    England and Wales · Girls