Unknown

An uncommon pick — distinctive and rare.

Boy's name| Also girlsDeclining
#3199 1202in 2024

Meaning & Origin

A variable (usually x, y or z) whose value is to be found.

Unknown appears in SSA birth records as a placeholder for births where no name was registered, reflecting the administrative reality that not all newborns receive an official name at the time of birth certificate filing.

Compare Unknown with another name

Popularity Over Time

Unknown climbed 654 spots in the last 20 years — from #3853 to #3199.

013727541254918801900192019401960198020002024

Popularity by Decade

Decade-by-decade popularity data for Unknown
DecadeBirthsTrend
2020s342
2010s789
2000s412
1990s1,296
1980s443
1970s196
1960s762
1950s4,206
1940s711
1930s64
1920s149
1910s211
1900s98
1890s97
1880s51

Year-by-Year Data

View complete yearly data(142 years, 18802024)
Year-by-year popularity data for the name Unknown
YearBirthsRank
202438#3199
202377#1997
202283#1903
202184#1850
202060#2286
201977#1932
201885#1806
201767#2089
201650#2548
201560#2251
201478#1882
201397#1602
201299#1597
201187#1716
201089#1724
2009113#1484
200873#1967
200742#2862
200625#3993
200523#4052

Source: U.S. Social Security Administration. Showing years with 5+ recorded births.

Unknown as a Girl's Name

Unknown is a true unisex name. As a girl's name, it has 9,775 recorded births since 1886.

#4021
Current rank
9,775
Total births
1954
Peak year
Compare Unknown as boy vs girl

Frequently Asked

Can Unknown be used for both boys and girls?
Yes, Unknown is used for both boys and girls. As a boy's name, it currently ranks #3199. As a girl's name, it ranks #4021.

Last updated May 2026 · Data: U.S. Social Security Administration (18802024) · Methodology