Lenni
Girl name · #3357 in 2025 · Very rare
How old is the name Lenni? In official American birth records, Lenni has been tracked continuously since 1966, giving it 59 years of documented American history.
In 2025, 46 baby girls were named Lenni, placing it at #3357 in the official national rankings. A decade ago it stood at #11835, so the name has been rising over the past ten years. Roughly one in every 39,130 girls born in 2025 was named Lenni.
The 59-year story
Lenni first appears in the Social Security records in 1966, when 5 girls received the name. Its all-time peak is essentially right now: 2023, with 52 babies and a rank of #3140. Names at their peak can keep climbing — or be one trend cycle from the long slide that eventually hits most popular names. Following the curve matters more than today's snapshot: a name's position on its rise-peak-decline arc is the best predictor of how common it will feel in a kindergarten class five years from now.
Babies named Lenni per year. Source: Official national birth records.
Unlock the 5-year forecast and compare Lenni against up to 5 other names.
Uniqueness: will there be another Lenni in class?
On our rarity read — which blends how common Lenni is today with its five-year momentum — the name reads as "very rare". A high score means genuine rarity — your Lenni will likely be the only one in the room, with the occasional spelling-out as the price.
Where Lenni is most common
State-level data for Lenni is too sparse in 2025 to rank by rate — in most states its count falls below the SSA's per-state reporting threshold (counts under 5 are withheld).
Names like Lenni
Statistically, parents drawn to Lenni tend to be choosing among names with similar popularity arcs, era profiles, and sounds — the closest matches in our model are Leilanni, Avanni, Ailanni, Jianni, and Leiani.
LeilanniAvanniAilanniJianniLeianiAylanniAlanniKaylanni
Rank history (last 25 years)
| Year | Babies named Lenni | Rank |
|---|---|---|
| 2025 | 46 | #3342 |
| 2024 | 45 | #3459 |
| 2023 | 52 | #3140 |
| 2022 | 29 | #4671 |
| 2021 | 32 | #4326 |
| 2020 | 30 | #4453 |
| 2019 | 25 | #5163 |
| 2018 | 13 | #8146 |
| 2017 | 20 | #6044 |
| 2016 | 15 | #7602 |
| 2015 | 8 | #11835 |
| 2014 | 9 | #10955 |
| 2013 | 6 | #14582 |
| 1977 | 6 | #8444 |
| 1966 | 5 | #6564 |
Frequently asked questions
How old is the name Lenni?
In official American birth records, the name Lenni first appeared in 1966 (over 59 years ago), when 5 newborn girls received the name. It has been tracked in modern national records for 59 years.
Is Lenni a popular girl name?
Lenni ranked #3357 among girls in 2025 with 46 babies given the name — outside the top 500, making it an uncommon pick. Ten years earlier it ranked #11835.
When was the name Lenni most popular?
Lenni peaked in 2023, when 52 American girls received the name (ranked #3140 that year). That peak is current — the name is at or near its all-time high right now.
How rare is the name Lenni?
In 2025, roughly 1 in 39,130 newborn American girls was named Lenni. On our rarity scale (rarity blended with momentum) we classify it as "very rare".
Data source: Official American birth records, 1880–2025, national and state files. Counts reflect registered birth records for American families.