Masterpiece Generator Name Generator
Delilah at 22, Olivia at 40
Same country, same year - but Reggie's mum and Rupert's mum are rarely the same age.
Mothers of Reggies are unlikely to be the same age as mothers of Ruperts — and by more than you would guess. In the ONS figures for England and Wales in 2025, the age of the mother is one of the sharpest dividing lines in the entire dataset. The clearest example: Olivia, the name most people would name if asked for Britain's default number one, is only number one among mothers aged 35 and over. Among mothers under 25 it sits at 20th, behind Delilah, Arabella and Mabel. The country does not have one favourite name but several, sorted by the age of the woman doing the naming.
The Olivia problem: one name, four different rankings
Split the girls' data by mother's age and Olivia slides down the table with every year knocked off. It is first for the over-35s, fourth for the 30–34 band, and by the time you reach mothers under 25 it has fallen to twentieth. Meanwhile Delilah — a name that barely registers for older mothers, at 105th — is the outright favourite for the youngest group. These are the widest swings in the data.
| Girls’ name | Rank, mothers under 25 | Rank, mothers 35+ |
|---|---|---|
| Delilah | 1 | 105 |
| Arabella | 2 | 55 |
| Mabel | 3 | 32 |
| Nevaeh | 22 | 262 |
| Bonnie | 29 | 75 |
| Nova | 28 | 119 |
| Olivia | 20 | 1 |
| Charlotte | 46 | 3 |
| Grace | 67 | 17 |
| Elizabeth | 112 | 45 |
| Victoria | 381 | 97 |
The top rows lean strongly younger; the bottom rows lean strongly older.
What younger mothers choose
- Delilah — First for under-25s, 105th for over-35s. Nothing else moves this far.
- Arabella — Second among the youngest mothers.
- Mabel — A diminutive registered as the whole name. Very much the house style here.
- Nevaeh — “Heaven” spelled backwards. 22nd for under-25s, 262nd for over-35s — an almost perfectly age-sorted name.
- Bonnie — Warm, informal, Scots-flavoured. Skews young.
- Nova — The astronomical/aspirational tilt that the youngest cohort favours.
The theme is consistent: names that are already a nickname (Mabel, Bonnie), names invented or repurposed recently (Nevaeh, Nova), and names carried quickly through online and pop-culture channels. Little of it is accidental. It is a coherent aesthetic — just a different one from the band above.
What older mothers choose
- Olivia — First for over-35s. The name gets more popular the older the mother.
- Charlotte — 3rd for over-35s, 46th for under-25s. A near-mirror of Delilah.
- Elizabeth — Given in full, not as Elsie or Eliza. That instinct is the giveaway.
- Eleanor — 43rd for over-35s, 140th for under-25s. Quietly, firmly grown-up.
- Victoria — 97th for over-35s and 381st for under-25s — one of the most age-skewed names of all.
- Grace — The virtue-name instinct, which strengthens with the mother’s age.
Older mothers reach for full, unabbreviated, heritage forms — the Edwardian-revival and regal register. They will name a girl Elizabeth and let the family arrive at Beth on their own. Younger mothers tend to register the short form outright. Same affection, opposite paperwork.
The boys: Muhammad the constant, a clean split underneath
| Boys’ name | Rank, mothers under 25 | Rank, mothers 35+ |
|---|---|---|
| Muhammad | 1 | 1 |
| Arlo | 3 | 36 |
| Reggie | 10 | 50 |
| Ronnie | 16 | 69 |
| Vinnie | 23 | 131 |
| Kylo | 75 | 598 |
| William | 62 | 15 |
| Alexander | 115 | 14 |
| Sebastian | 105 | 18 |
| Rupert | 298 | 67 |
| Wilfred | 484 | 87 |
The under-25 favourites are the diminutive, cheerful, faintly retro set — Reggie, Ronnie, Vinnie, Tommy, Albie. The name Kylo, borrowed wholesale from Star Wars, is the sharpest single divide of the lot: 75th among the youngest mothers, 598th among the oldest. Over-35s move the opposite way, toward the full and the formal: Alexander, Sebastian, Edward, Rupert, Wilfred, Jasper. The younger cohort registers the nickname; the older cohort registers the name the nickname comes from.
Why age shapes the name
None of this is random, and no single cause explains it. A few forces stack up in the same direction:
- The nostalgia clock — Names revive on roughly a three-generation lag. Mabel, Arthur and Edith feel fresh to a young parent precisely because they belong to a great-grandparent, not a parent. Older mothers, born earlier, sit at a different point on the same cycle.
- Nickname-as-name — The dominant stylistic move among younger parents is to register the diminutive itself — Reggie, not Reginald; Mabel, not Mabel-from-Amabel. Older parents keep the long form and let the short one emerge.
- Faster cultural transmission — Names carried by songs, screens and social feeds — Delilah, Nevaeh, Kylo, Nova — move through younger, more online cohorts first. By the time they reach older mothers, if they do, the moment has often passed.
- Delayed motherhood and the prestige register — Later first-time motherhood correlates with a pull toward heritage and “safe” classic names — Charlotte, Eleanor, Elizabeth, Rupert. The age band is partly standing in for other things it tends to travel with.
- A naming practice that ignores age — Muhammad stays first in every band because it reflects a naming tradition — honouring the Prophet — that does not fashion-cycle. While the rest of the field fragments across spellings and trends, it stays concentrated, and stays put.
The practical takeaway, if you are choosing a name and glancing nervously at the charts: the “most popular name in the country” is a less useful number than it looks. Depending on which table you read, Britain's favourite girls' name in 2025 is either Olivia or Delilah. Both are true. They just belong to different groups of mother.
Last updated: 9 July 2026
Common questions
What was the most popular baby name in England and Wales in 2025?
For boys, Muhammad was first in every mother's age band. For girls it depends on the mother's age: Olivia was first among mothers aged 35 and over, while Delilah topped the list for mothers under 25.
Why isn't Olivia the top girls' name for younger mothers?
Olivia skews toward older mothers. It ranks first for the over-35s but only 20th for mothers under 25, who favour softer, more ornate or diminutive names such as Delilah, Arabella and Mabel.
Which baby names are most associated with younger mothers?
For girls, Delilah, Arabella, Mabel, Nevaeh, Bonnie and Nova. For boys, Arlo, Reggie, Ronnie, Vinnie and Kylo. The common thread is diminutive, informal or recently popularised names.
Does a mother's age really predict the style of name she chooses?
Strongly, in the 2025 ONS data. Younger mothers favour nickname-style and inventive names; older mothers favour full, classic, heritage forms. Muhammad is the notable exception, ranking first across every age band.