Castaldi

surname · Latin script

Meaning: forma plural de Castaldo

Recorded for both men and women· direction only, no split published

/kɑˈstɑɫdi/(machine-generated) pronunciation, model-generated

Castaldi is a surname written in the Latin script, with more bearers in the United States than in any other country.

rarermore common
  • ARArgentina1 in 223K(measured from records)
  • UYUruguay1 in 51K
  • CHSwitzerland1 in 205K

carrying the name, as counted by each country's national register. One hue, darker where it is more common; hover a country for its figure.

United States (measured from records)

809 people, 2010

Sources
66 (measured from records)

Highest-authority source

1 in 51K (inferred from the name graph)

Uruguay

measured from records inferred from the name graph

Name dossier (print, CSV)

Meaning & origin(measured from records)

forma plural de Castaldo

Sources 1

  • Dicionário dos sobrenomes italianos

Attested in 1 language in the etymology graph.

Where in the world(measured from records)

Castaldi 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.

Where Castaldi is recorded, by country
CountryMost common spellingSources
US United States8091 in 411K1.1KCastaldi66
BR Brazil5411 in 391K541Castaldi49
AR Argentina2041 in 223K204Castaldi34
UY Uruguay661 in 51K66Castaldi14
CH Switzerland411 in 205K41—4

809 people counted by Census Bureau — Surname Frequency 2010, 2010. 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: RENAPER — Apellidos (person counts, national); Census Bureau — Surname Frequency 2010; Census Bureau — Surname Frequency 2020; IBGE — Censo 2022 Nomes no Brasil per-token lookup (v3 API, given+surname); INE Uruguay — Apellidos más frecuentes 1902–2024 (Tableau Public); BFS — Familiennamen der Wohnbevölkerung (surnames). 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 names spelled this way(inferred from the name graph)

Castaldi is also recorded as another name, grouped separately because the records behind them do not connect to the one described above.

  • Russian surname6 spellings in the group

    Most recorded in Russia, Türkiye, United States, Italy

    Languages: Russian, Ukrainian

    Also written Кастальди, Кастальді

34 further groups record this spelling and are not listed here.

Grouping is the name graph's, not a register's: two spellings join a group when the evidence links them, so a group is a claim about the records rather than about the people.

Other recorded senses(measured from records)

Castaldi is also recorded in one other lexicon, as a different name or as an ordinary word. These are senses of the spelling, not of the name above.

  • In Latin, inflection of castaldus:

    as a wordkaikki.org Wiktionary extract (IPA + transliterations)

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.

Notable people with this name(measured from records)

1400160018002000Panfilo Castaldi, b. 1430Bellerofonte Castaldi, b. 1580Alfonso Castaldi, b. 1874Ettore Castaldi, b. 1877Vincenzo Castaldi, b. 1916Paolo Castaldi, b. 1930Jean-Pierre Castaldi, b. 1944Benjamin Castaldi, b. 1970Gianluca Castaldi, b. 1970Paolo Castaldi, b. 1982

The ten people covered by the most Wikipedia language editions — a proxy for cross-cultural notability, which favours historical and Western figures over equally prominent contemporary ones — shown by birth year. Source: Wikidata (CC0).

How to address them(machine-generated)

FormalDear Castaldi,
InformalHello,

Evidence(measured from records)

Attested in 24 sources across 13 countries.

Official registers attesting Castaldi
CountryRegisterYearCountRank
US United StatesCensus Bureau — Surname Frequency 202020201.1K#24,511
US United StatesCensus Bureau — Surname Frequency 20002000923#25,199
US United StatesCensus Bureau — Surname Frequency 20102010809#29,261
BR BrazilIBGE — Censo 2022 Nomes no Brasil per-token lookup (v3 API, given+surname)—541#15,852
AR ArgentinaRENAPER — Apellidos (person counts, national)—204—
UY UruguayINE Uruguay — Apellidos más frecuentes 1902–2024 (Tableau Public)—66—
CH SwitzerlandBFS — Familiennamen der Wohnbevölkerung (surnames)202441#21,670
US United Stateswru Name Dictionary — US surnames, Census 2010 subset (Khanna et al.)———

Reference works 5

  • Nederlandse FamilienamenBank (Dutch surname bank; ex-Meertens Instituut, now CBG)2007
  • Wikipedia surname tokens
  • Wikidata name items (native-script + romanized given/family names)
  • jeantosti.com — Dictionnaire des noms de famille de France et d'ailleurs (Jean Tosti)
  • Cognomix.it (Nomix s.r.l.) — Italian surname origin dictionary

These works list the name; their figures are licensed and are not reproduced here.

Register rows as of the 2026-10-09 data build.

Frequently asked questions

What does the name Castaldi mean, and where does it come from?
forma plural de Castaldo Recorded by Dicionário dos sobrenomes italianos.
How do you pronounce Castaldi?
A machine transcription gives /kɑˈstɑɫdi/ (IPA) for English.
In which country does Castaldi have the most bearers?
In the United States, the national register counted about 809 people named Castaldi, more than in any other country we hold, where it is most often spelled castaldi.
Where is Castaldi most common?
Measured as a share of residents rather than as a count, Castaldi is densest in Uruguay — about 1 in 51 thousand people — even though United States holds more of our records for it.
How common is the name Castaldi?
In the United States, the national register counted 809 people named Castaldi in 2010, about 1 in 411 thousand residents.

What do you want to know about Castaldi?

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Query this name via API
curl -H "X-API-Key: YOUR_KEY" https://api.mondonomo.ai/api/v1/name-graph/castaldi

The 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, “Castaldi”. Data snapshot 2026-10-10.

See how Castaldi parses inside a full name →