Meaning not yet researched.
Caius: US boys given the name each year, 1880 to 2025, from Social Security card applications. 254 in 2025. Its best rank was #927 in 2025.
US births per year · SSA card applications
Its highest rank in 146 years of records is this year’s. Every baby recorded as Caius in 2025 was a boy.
Baby name · US data 1880–2025
#927 for US boys in 2025, its highest rank in 146 years of records.
Hover, tap or use the arrow keys for any year. Years with fewer than five babies of a sex are not published by SSA and show as zero.
Caius: US boys given the name each year from 1880 to 2025. 254 boys in 2025. Peak: #927 in 2025 · most boys in one year: 254 (2025).
In 2025, 254 US boys were named Caius, making it the 927th most common boys’ name of the year, up 133 places from #1,060 in 2024. That is 48 more than the 206 boys named Caius in 2024. Its best rank for boys was #927, reached in this year, 2025. That year also had the most boys given the name: 254. For comparison, it was #1,289 in 2015 and unranked in 1950.
Social Security card records list Caius in 28 years of the 146 from 1880 to 2025, starting in 1994 with 5 babies. In all, 2,329 US babies have been given the name, all of them boys. Its busiest decade was the 2010s, with 1,068 babies named Caius.
Over the 10 years from 2016 to 2025, 1,574 US boys were named Caius; the busiest of those years was 2025, with 254. In 2025 that was about 1 in 6,725 of the boys in SSA’s list for the year.
Among the states, Caius ranked highest in Maryland in 2025, at #578 for boys there. It was not in the top 100 of any state. Related spellings in the SSA files include Kaius (2,011 babies since 1880). Rarer spellings such as Gaius, Qais and Kaiis are summarised on this page.
Meaning not yet researched.
We publish a meaning only with a cited source and a confidence label, and never generate one. Meanings are being researched for the most common names first.
Rare spellings summarised here: Gaius (529), Qais (467), Kaiis (13).
Numbers are all-time US births. Links come from Wikidata’s “said to be the same as” (P460, CC0) and our spelling rule: at most two letters different, with the same sound pattern.
No nicknames listed for Caius in the open dataset we use.
Source: carltonnorthern/nicknames (Apache-2.0).
US boys. Rank within each state. SSA leaves out states where fewer than five boys got the name, so 30 are not listed.
| State | Births 2025 | Rank 2025 | Rank 2015 |
|---|---|---|---|
| Maryland | 8 | #578 | #586 |
| Minnesota | 8 | #594 | — |
| Indiana | 10 | #627 | — |
| Tennessee | 11 | #642 | — |
| Massachusetts | 6 | #708 | — |
| Oklahoma | 5 | #716 | — |
| Ohio | 12 | #718 | — |
| Missouri | 7 | #724 | #840 |
| Washington | 8 | #741 | — |
| Wisconsin | 5 | #801 | #685 |
| California | 30 | #809 | #1,020 |
| North Carolina | 10 | #832 | — |
| Pennsylvania | 9 | #861 | — |
| Texas | 28 | #896 | — |
| Michigan | 7 | #917 | — |
| Arizona | 5 | #940 | #907 |
| Virginia | 5 | #1,118 | #897 |
| Georgia | 7 | #1,120 | — |
| Illinois | 5 | #1,319 | — |
| Florida | 6 | #1,665 | #1,727 |
| New York | 5 | #1,809 | — |
Births and national rank for each year SSA lists the name, newest first.
| Year | Girls | Girls rank | Boys | Boys rank |
|---|---|---|---|---|
| 2025 | — | — | 254 | #927 |
| 2024 | — | — | 206 | #1,060 |
| 2023 | — | — | 140 | #1,347 |
| 2022 | — | — | 150 | #1,282 |
| 2021 | — | — | 138 | #1,341 |
| 2020 | — | — | 156 | #1,209 |
| 2019 | — | — | 137 | #1,328 |
| 2018 | — | — | 130 | #1,361 |
| 2017 | — | — | 110 | #1,512 |
| 2016 | — | — | 153 | #1,224 |
| 2015 | — | — | 138 | #1,289 |
| 2014 | — | — | 124 | #1,377 |
| 2013 | — | — | 109 | #1,494 |
| 2012 | — | — | 74 | #1,924 |
| 2011 | — | — | 44 | #2,709 |
| 2010 | — | — | 49 | #2,520 |
| 2009 | — | — | 43 | #2,806 |
| 2008 | — | — | 27 | #3,840 |
| 2007 | — | — | 29 | #3,610 |
| 2006 | — | — | 15 | #5,557 |
| 2005 | — | — | 23 | #3,958 |
| 2004 | — | — | 14 | #5,537 |
| 2003 | — | — | 15 | #5,072 |
| 2002 | — | — | 13 | #5,439 |
| 2001 | — | — | 16 | #4,703 |
| 2000 | — | — | 10 | #6,382 |
| 1999 | — | — | 7 | #7,975 |
| 1994 | — | — | 5 | #8,979 |
About the data: counts are Social Security card applications for US births, for names given to at least five babies of a sex in a year (SSA, names.zip, public domain). Ranks follow SSA’s own order: most births first, ties alphabetical. Files retrieved 2026-10-05 (checksum on our sources page).