Kaci vs Lydia
Kaci and Lydiacompared 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 · Girls
In 2018, Kaci was ranked #313 and Lydia #145 among girls in Northern Ireland.
Scotland · Girls
In 2024, Kaci was ranked #790 and Lydia #157 among girls in Scotland.
England and Wales · Girls
In 2024, Kaci was ranked #2771 and Lydia #174 among girls in England and Wales.
Republic of Ireland · Girls
In 2024, Kaci was ranked #736 and Lydia #342 among girls in Republic of Ireland.
Kaci and Lydia over time
Kaci and Lydia appear together in 3 published lists, across 66 years of shared records. Lydia held the stronger position in more years in 3 of them, Kaci in 0.
In none of those lists did their order change and stay changed.
Lydia reached its own highest recorded position earlier in 3 of those lists, and Kaci 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.
- Peaked in the same years
Both reached their highest recorded position in Republic of Ireland · Girls within 2 years — Kaci #229 in 2002, Lydia #159 in 2001.
List by list
England and Wales · Girls26 shared years, 1998–2024
Kaci held the stronger position in 0 of those years, Lydia in 26.
Highest recorded here: Kaci #192 in 2002, Lydia #50 in 1998.
The order between them never changed and held in this list.
Most recent shared year, 2024: Kaci #2771, Lydia #174.
Republic of Ireland · Girls24 shared years, 2001–2024
Kaci held the stronger position in 0 of those years, Lydia in 24.
Highest recorded here: Kaci #229 in 2002, Lydia #159 in 2001.
The order between them never changed and held in this list.
Most recent shared year, 2024: Kaci #736, Lydia #342.
Northern Ireland · Girls16 shared years, 2001–2018
Kaci held the stronger position in 1 of those years, Lydia in 14.
Highest recorded here: Kaci #123 in 2011, Lydia #73 in 2008.
The order between them never changed and held in this list.
Most recent shared year, 2018: Kaci #313, Lydia #145.
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 | Kaci | Lydia |
|---|---|---|
| Record type | Official statistical record (evidence-only) | Official statistical record (evidence-only) |
| Gender usage | female | female |
| Meaning | Not yet recorded | Not yet recorded |
| Origin | Not yet recorded | Not yet recorded |
| Pronunciation | Not yet recorded | Not yet recorded |
| Syllables | 2 | 2 |
| Common variants / nicknames | Not yet recorded | Not yet recorded |
| Recorded regional usage | GB-ENW, GB-NIR, GB-SCT, IE | GB-ENW, GB-NIR, GB-SCT, IE, NO, NZ |
| Most recent popularity observation | Republic of Ireland · Girls #736 (2024) | Norway · Girls #142 (2025) |
| Pronunciation clarity (demonstration score) | Not yet recorded | Not yet recorded |
| Spelling simplicity (demonstration score) | 95/100 | 94/100 |
| International familiarity (demonstration score) | 100/100 | 100/100 |
| Data Confidence | medium | medium |
What the data shows
- Kaci and Lydia both have 2 syllables.
- Both names have recorded usage in GB-ENW, GB-NIR, GB-SCT, IE.
How each name got here
Kaci
Popularity journey
First recorded1998
First recorded at #3848 among girls in England and Wales in 1998 — the earliest year that source publishes this name, not necessarily the earliest it was used.
England and Wales · Girls
Highest recorded2001–2018
Highest recorded position: #123 among girls in Northern Ireland, in 2011 (recorded 2001–2018).
Northern Ireland · Girls
Most recent2024
Most recently recorded at #2771 among girls in England and Wales, in 2024.
England and Wales · Girls
Lydia
Popularity journey
First recorded1946
First recorded at #380 among girls in Norway in 1946 — the earliest year that source publishes this name, not necessarily the earliest it was used.
Norway · Girls
Highest recorded1996–2024
Highest recorded position: #50 among girls in England and Wales, in 1998 (recorded 1996–2024).
England and Wales · Girls
Most recent2025
Most recently recorded at #142 among girls in Norway, in 2025.
Norway · Girls