Faddei
given name · Latin script
Recorded as a male name· opposite-gender records fall within measured source noise
/fædaɪ/(machine-generated) pronunciation, model-generated
Faddei is a given name written in the Latin script, with more bearers in the United States than in any other country.
- RURussia≈1 in 368Kas Фаддей(inferred from the name graph)
- MDMoldova1 in 481K
- GYGuyana1 in 107Kas Thaddaeus
carrying the name, as counted by its national register where one exists and as Mondonomo estimates it elsewhere (marked ≈ and "est." on hover). Where a country counts another spelling of the name rather than Faddei itself, the figure is that spelling’s, and it is named. One hue, darker where it is more common; hover a country for its figure.
- United States (measured from records)
- 2 (measured from records)
- Sources
- 74 (measured from records)
- 1 in 481K (inferred from the name graph)
852 named Thadeus, 2020
recorded for this name
Highest-authority source
Moldova
measured from records inferred from the name graph
Spellings & scripts(measured from records)
Locally spelled Фаддей in RU Russia, KZ Kazakhstan and Thadeus in US United States.
Spellings marked ● are how people bearing the name write it in our records, and ○ marks a model's transliteration; click a spelling to open its page.
Meaning & origin
No verified etymology recorded for this name yet — the entries below are drawn from usage statistics and the name graph.
Attested across 11 languages in the etymology graph.
Where in the world(measured from records)
Faddei counted together with the spellings and other-language forms grouped with it. Where a register counted another spelling, the row names it.
Sorted by bearers: national registers' counts, and Mondonomo's estimates (≈, est.) where no register counts.
| Country | Most common spelling | Sources | |||
|---|---|---|---|---|---|
| US United States | 852as Thadeus | 1 in 390K | 852 | Thadeus | 3 |
| RU Russia | ≈390 est. | ≈1 in 368K | #1,304 | Фаддей | 74 |
| NL Netherlands | 70as Thadeus | 1 in 247K | 70 | — | — |
| KZ Kazakhstan | ≈24 est. | ≈1 in 808K | 25 | Фаддей | 15 |
| SE Sweden | 16as Thadeus | 1 in 638K | 16 | — | — |
| GY Guyana | 7as Thaddaeus | 1 in 107K | 7 | — | — |
| MD Moldova | 7 | 1 in 481K | 7 | — | — |
852 people counted by Census Bureau — First Name Frequency 2020 by sex, 2020. Exact figures are national registers' own counts, while figures marked ≈ and est. are Mondonomo’s estimates, counted from our sources and calibrated against those registers; hover one for how far to trust it in that country. A dash means neither exists.
Registers cited: Census Bureau — First Name Frequency 2020 by sex; Bureau of National Statistics — birth registrations; Meertens NVB — Nederlandse Voornamenbank (all-time BRP bearer counts, 2018); Skatteverket — Sök hur många som har ett visst namn (living population); Guyana — Official List of Electors July 2025; e-services.md — living population register. Figures without a register are Mondonomo estimates; see Methodology.
Country figures for a list of names, at full precision, are available under licence rather than by scraping this table (how that works).
Other recorded senses(measured from records)
Faddei is also recorded in 2 other lexicons, as a different name or as an ordinary word. These are senses of the spelling, not of the name above.
In Russian, Russianiation of Thaddeus.
as a wordA Dictionary of Period Russian Names (Wickenden / Goldschmidt 1996)
Russian form of THADDEUS .
as a word
Ordered by how much of this spelling's record each language holds, so a sense from a language the name is barely used in sits last rather than first.
How to address them(machine-generated)
A formal English salutation is built on the surname, so it needs a full name — on its own, a first name only supports the informal form.
Evidence(measured from records)
Attested in 7 sources across 5 countries.
| Country | Register | Year | Count | Rank |
|---|---|---|---|---|
| MD Moldova | e-services.md — living population register | — | 7 | #3,526 |
Register rows as of the 2026-10-09 data build.
Frequently asked questions
- What are other forms of the name Faddei?
- In the etymology graph, Tadeusz, Thaddeus and Tadeu are forms of the same name in other languages.
- How do you pronounce Faddei?
- A machine transcription gives /fædaɪ/ (IPA) for Ukrainian.
- Is Faddei a male or female name?
- Faddei is a male name in our records. Opposite-gender entries fall within the cross-gender noise we measure in the source data, so we don't report them as usage.
- In which country does Faddei have the most bearers?
- In the United States, the national register counted about 852 people named Thadeus, more than in any other country we hold.
- Where is Faddei most common?
- Measured as a share of residents rather than as a count, Faddei is densest in Moldova — about 1 in 481 thousand people — even though United States holds more of our records for it.
- How common is the name Faddei?
- In Moldova, the national register counted 7 people named Faddei, about 1 in 481 thousand residents.
What do you want to know about Faddei?
Nobody replies to these one by one, but what readers ask decides what these pages answer next.
Query this name via API
curl -H "X-API-Key: YOUR_KEY" https://api.mondonomo.ai/api/v1/name-graph/faddeiThe payload this page is built from: spellings and scripts, countries and languages, related names, and the registers that attest the form. It takes a free API key (1,000 requests a day), which returns what this page shows everyone; the full country table, every register citation and the year-by-year series come with a licensed key, as does bulk access.
About this data
measured from records inferred from the name graph machine-generated
These figures come from the data snapshot of and will change as it is rebuilt.
Statistics are aggregated from the Mondonomo name corpus; related names and etymology are inferred from the name graph; pronunciation and any machine-marked transliterations are model-generated. Read how the numbers are made, including their known failure modes, and where the data comes from.
Reference works we consult — surname dictionaries, official name registers, Wikidata and Wiktionary — are named directly, beside the claims they support. The per-country source counts also include datasets of person records: we publish how many there are and their authority tier, but not their names.
Cite this page Mondonomo, “Faddei”. Data snapshot 2026-10-10.