HUMAN NAME · NOT ON THE REGISTRY

Thadeo

A human name, held in the Social Security file. It is not in the Administration’s index of agent names, and it has no classification.

Table 1. Thadeo, as recorded
Sex	Male
2025 rank	4,129
2025 number	26
Peak year	2025
Peak rank	4,129
Years present	10 of 146
Dog licences, New York	–
Pet licences, Seattle	–

Statement of record

Thadeo was given to 26 boys in 2025, ranking 4,129th for the year. It peaked in 2025, when it ranked 4,129th and went to 26 babies. It has appeared in 10 of the 146 years on record. It has climbed 5,342 places since 2020.

Figure 1. Popularity of a Name: Thadeo

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.

Villain probability

36%

Basis: phonetics, by spelling. One voiced obstruent, ends in a vowel. The pronouncing dictionary has no entry, so the letters were sounded out by a stated rule.

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.

As recorded on the Social Security card application. Names given to fewer than five babies of a sex in a year are not published, so the file is a floor.