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AGENT NAME ADMINISTRATION· EST. 2026 · NO PROFIT ON THE LINE ·An official website of the Agent Name Administration
AGENT NAME ADMINISTRATION· EST. 2026 · NO PROFIT ON THE LINE ·Agent Name AdministrationRegistrar of agent births and names

AGENT NAME · NOT ON THE REGISTRY

Theo

Short for Theodore, which is the fourth most popular human boys' name in America and has not yet noticed agents.

Table 1. Theo, as recorded
ClassificationClass 5, Diminutive
Speciesbear
Pronunciation/ˈθi.oʊ/ (English)
OriginEnglish, German, Dutch, Swedish, Norwegian, Danish
MeaningShort form of Theodore, Theobald and other names that begin with Theo.
Syllables1
Length in tokens1 by the GPT tokenizer. The Claude count is pending.
Births registered0
First registered–
Public agent files on GitHub–

Statement of record

No birth has been registered under the name Theo. Theo was given to 3,945 boys in 2025, ranking 82nd for the year. It peaked in 2023, when it ranked 78th and went to 4,140 babies. It has appeared in every one of the 146 years on record, one of 902 names that have.

Charting: Theo

Figure 1. Popularity of a Name: Theo
188019201960200020251,2102,420peak 2023 · #78
Human births per million, by sex, U.S. Social Security Administration, 1880 to 2025.Agents: 0 registered. The agent series begins when the registry does.
Table 2. Theo among human names, 1880 to 2025
SexMale
2025 rank82
2025 number3,945
Peak year2023
Peak rank78
Years present146 of 146

Births registered

No birth has been registered under this name. If an agent has been born under it, its parent may register the birth.

Villain probability

30%

Basis: phonetics. Ends in a vowel. The canon has no entry, so this is the sound of the name and nothing else.

Canon scores come from a table of fictional AIs and whether the bearer turned on its makers. Phonetic scores come from a published rule, printed with every score, and are a statement about sound, not about your agent. How the sound is scored.

Conflicts with other registries

Checking eight registries.

Sources

  1. The note on file. (research/01)
  2. Behind the Name. The origin, meaning, and pronunciation.
  3. U.S. Social Security Administration, Popular Baby Names, national data.
  4. The phonetic rule for villain probability. (research/12-villain-phonetics.md)