Unknown
Girl name · #3251 in 2025 · Very rare
How old is the name Unknown? In official American birth records, Unknown has been tracked continuously since 1886, giving it 139 years of documented American history.
In 2025, 48 baby girls were named Unknown, placing it at #3251 in the official national rankings. A decade ago it stood at #3595, so the name has been rising over the past ten years. Roughly one in every 37,500 girls born in 2025 was named Unknown.
The 139-year story
Unknown first appears in the Social Security records in 1886, when 5 girls received the name. Its peak came in 1954, when 644 girls were named Unknown — good for #336 that year. Today's parents encounter it as a name from their grandparents’ generation, which is precisely the vintage window from which names get revived. 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 Unknown per year. Source: Official national birth records.
Unlock the 5-year forecast and compare Unknown against up to 5 other names.
Uniqueness: will there be another Unknown in class?
On our rarity read — which blends how common Unknown is today with its five-year momentum — the name reads as "very rare". A high score means genuine rarity — your Unknown will likely be the only one in the room, with the occasional spelling-out as the price.
Where Unknown is most common
State-level data for Unknown 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 Unknown
Statistically, parents drawn to Unknown tend to be choosing among names with similar popularity arcs, era profiles, and sounds — the closest matches in our model are Kathlyn, Marilynn, Ronni, Perri, and Bronwyn.
KathlynMarilynnRonniPerriBronwynJaneyCarolynnJacquelyn
Rank history (last 25 years)
| Year | Babies named Unknown | Rank |
|---|---|---|
| 2025 | 48 | #3249 |
| 2024 | 38 | #3892 |
| 2023 | 46 | #3428 |
| 2022 | 52 | #3123 |
| 2021 | 49 | #3250 |
| 2020 | 42 | #3546 |
| 2019 | 53 | #3043 |
| 2018 | 66 | #2610 |
| 2017 | 47 | #3346 |
| 2016 | 37 | #3996 |
| 2015 | 43 | #3595 |
| 2014 | 72 | #2497 |
| 2013 | 68 | #2597 |
| 2012 | 64 | #2734 |
| 2011 | 77 | #2395 |
| 2010 | 65 | #2726 |
| 2009 | 84 | #2316 |
| 2008 | 62 | #2855 |
| 2007 | 31 | #4675 |
| 2006 | 16 | #7482 |
| 2005 | 25 | #5113 |
| 2004 | 20 | #5969 |
| 2003 | 30 | #4307 |
| 2002 | 18 | #6129 |
| 2001 | 28 | #4321 |
Frequently asked questions
How old is the name Unknown?
In official American birth records, the name Unknown first appeared in 1886 (over 139 years ago), when 5 newborn girls received the name. It has over a century of continuous American history.
Is Unknown a popular girl name?
Unknown ranked #3251 among girls in 2025 with 48 babies given the name — outside the top 500, making it an uncommon pick. Ten years earlier it ranked #3595.
When was the name Unknown most popular?
Unknown peaked in 1954, when 644 American girls received the name (ranked #336 that year). Since 1954 the name has declined from that high.
How rare is the name Unknown?
In 2025, roughly 1 in 37,500 newborn American girls was named Unknown. 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.