Millie vs Sienna
Millie and Siennacompared 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, Millie was ranked #5 and Sienna #41 among girls in Scotland.
New South Wales, Australia · Girls
In 2025, Millie was ranked #40 and Sienna #10 among girls in New South Wales, Australia.
England and Wales · Girls
In 2024, Millie was ranked #27 and Sienna #19 among girls in England and Wales.
New Zealand · Girls
In 2023, Millie was ranked #19 and Sienna #53 among girls in New Zealand.
Northern Ireland · Girls
In 2024, Millie was ranked #150 and Sienna #30 among girls in Northern Ireland.
Republic of Ireland · Girls
In 2025, Millie was ranked #36 and Sienna #62 among girls in Republic of Ireland.
Norway · Girls
In 2025, Millie was ranked #149 and Sienna #136 among girls in Norway.
Millie and Sienna over time
Millie and Sienna appear together in 5 published lists, across 98 years of shared records. Sienna held the stronger position in more years in 3 of them, Millie in 2.
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.
Sienna reached its own highest recorded position earlier in 2 of those lists, Millie 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 took the other's place near the top
In New Zealand · Girls, Millie moved into the top 50 at #25 in 2020 as Sienna fell out of it to #71, having been #35 the year before.
- One moved ahead of the other
In 2013, Sienna moved ahead of Millie in England and Wales · Girls — #26 and #31 the year before became #25 and #22.
- Peaked in the same years
Both reached their highest recorded position in England and Wales · Girls within 2 years — Millie #18 in 2022, Sienna #12 in 2022.
List by list
England and Wales · Girls29 shared years, 1996–2024
Millie held the stronger position in 17 of those years, Sienna in 12.
Highest recorded here: Millie #18 in 2022, Sienna #12 in 2022.
The order changed in 2013: Sienna moved ahead. In 2012 they stood at #26 and #31; by 2013 that had become #25 and #22.
Most recent shared year, 2024: Millie #27, Sienna #19.
Republic of Ireland · Girls23 shared years, 2002–2025
Millie held the stronger position in 22 of those years, Sienna in 1.
Highest recorded here: Millie #19 in 2022, Sienna #44 in 2022.
The order between them never changed and held in this list.
Most recent shared year, 2025: Millie #36, Sienna #62.
Northern Ireland · Girls21 shared years, 2004–2024
Millie held the stronger position in 0 of those years, Sienna in 20.
Highest recorded here: Millie #76 in 2022, Sienna #30 in 2024.
The order between them never changed and held in this list.
Most recent shared year, 2024: Millie #150, Sienna #30.
New Zealand · Girls17 shared years, 2007–2023
Millie held the stronger position in 5 of those years, Sienna in 12.
Highest recorded here: Millie #17 in 2022, Sienna #23 in 2009.
The order changed in 2020: Millie moved ahead. In 2019 they stood at #39 and #35; by 2020 that had become #25 and #71.
Most recent shared year, 2023: Millie #19, Sienna #53.
New South Wales, Australia · Girls8 shared years, 2017–2025
Millie held the stronger position in 0 of those years, Sienna in 8.
Highest recorded here: Millie #31 in 2023, Sienna #9 in 2022.
The order between them never changed and held in this list.
Most recent shared year, 2025: Millie #40, Sienna #10.
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 | Millie | Sienna |
|---|---|---|
| Record type | Editorially researched profile | Editorially researched profile |
| Gender usage | female | female |
| Meaning | A diminutive of longer names like Mildred and Millicent, connecting to the broader family of names with the 'mil' element (including Camilla and Aemilia). | From the English word for the orange-red colour, ultimately from the Italian city of Siena, known for its distinctive reddish clay. |
| Origin | Germanic/Latin, diminutive form | English (colour/place name) |
| Pronunciation | /ˈmɪl.i/ | /si.ˈɛn.ə/ |
| 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 | AU-NSW, GB-ENW, GB-NIR, GB-SCT, IE, NO, NZ |
| Most recent popularity observation | Republic of Ireland · Girls #36 (2025) | New South Wales, Australia · Girls #10 (2025) |
| Pronunciation clarity (demonstration score) | 90/100 | 90/100 |
| Spelling simplicity (demonstration score) | 88/100 | 88/100 |
| International familiarity (demonstration score) | 100/100 | 100/100 |
| Data Confidence | medium | medium |
What the data shows
- Millie is recorded with a Germanic/Latin, diminutive form origin, while Sienna is recorded with a English (colour/place name) origin.
- Millie and Sienna both have 2 syllables.
- Millie's recorded meaning differs from Sienna'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
Millie
Popularity journey
First recorded1996
First recorded at #140 among girls in England and Wales in 1996 — the earliest year that source publishes this name, not necessarily the earliest it was used.
England and Wales · Girls
Most recent2025
Most recently recorded at #40 among girls in New South Wales, Australia, in 2025.
New South Wales, Australia · Girls
Sienna
Popularity journey
First recorded1996
First recorded at #974 among girls in England and Wales in 1996 — the earliest year that source publishes this name, not necessarily the earliest it was used.
England and Wales · Girls
Highest recorded2003–2025
Highest recorded position: #7 among girls in New South Wales, Australia, in 2009 (recorded 2003–2025).
New South Wales, Australia · Girls
Most recent2025
Most recently recorded at #10 among girls in New South Wales, Australia, in 2025.
New South Wales, Australia · Girls