Loucas

given name · Latin script

Recorded as a male name· opposite-gender records fall within measured source noise

Loucas is a given name written in the Latin script, with more bearers in Brazil than in any other country, where it is the 19th most common given name.

rarermore common
  • CZCzechia1 in 52as Lukáš(measured from records)
  • BRBrazil1 in 158as Lucas
  • ARArgentina≈1 in 233as Lucas

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 Loucas 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.

Brazil (measured from records)

1,341,525 named Lucas, 2022

#405 (measured from records)

of 15M given names

4 (measured from records)

recorded for this name

Sources
410 (measured from records)

Highest-authority source

1 in 52 (inferred from the name graph)

Czechia, as Lukáš

measured from records inferred from the name graph

Name dossier (print, CSV)

Spellings & scripts(measured from records)

LucasLatin(measured from records)
ЛукашCyrillic(measured from records)
ΛουκαςGreek(measured from records)
ლუკასGeorgian(measured from records)

2 other spellings are counted as the same name:

Locally spelled Lucas in BR Brazil, AR Argentina, US United States and 1 more and Lukáš in CZ Czechia.

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.

Where in the world(measured from records)

Loucas 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 Loucas is recorded, by country
CountryMost common spellingSources
BR Brazil#191,341,525as Lucas1 in 1581.3MLucas280
US United States—249,246as Lucas1 in 1.3K249KLucas410
CZ Czechia#16205,964as Lukáš1 in 52206KLukáš178
AR Argentina#97≈200,000 est.≈1 in 2333.2KLucas209
FR France—≈130,000 est.≈1 in 527186KLoucas115
LT Lithuania—≈17,000 est.≈1 in 15920K—7
UY Uruguay#31≈12,000 est.≈1 in 283—Lucas99

1,341,525 people counted by IBGE — names by decade (Kaggle mirror), 2022. 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: IBGE — names by decade (Kaggle mirror); RENAPER — Apellidos (person counts, national); Census Bureau — First Name Frequency 2020 by sex; MVČR — living population register 2017; INSEE — Fichier des prénoms (1900–2024); Registrų centras — top-50 given names. 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)

Loucas is also recorded as 3 other names, grouped separately because the records behind them do not connect to the one described above.

  • English given name5 spellings in the group

    Most recorded in United States, United Kingdom, Australia, Cyprus

    Languages: English, German, Dutch

    Also written Lóúćáś

  • Portuguese given name4 spellings in the group

    Most recorded in United States, Brazil, United Kingdom, Cyprus

    Languages: Portuguese, Spanish

    Also written Lóucás, Loučas

  • Arabic name3 spellings in the group

    Also written Lõûcãs

32 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)

Loucas 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 Portuguese, feminine plural of louco

    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)

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).

Evidence(measured from records)

Attested in 20 sources across 12 countries.

Official registers attesting Loucas
CountryRegisterYearCountRank
US United StatesCensus Bureau — Surname Frequency 20102010201#91,625
US United StatesCensus Bureau — Surname Frequency 20202020194#99,694
US United StatesCensus Bureau — Surname Frequency 20002000180#94,227
US United Stateswru Name Dictionary — US surnames, Census 2010 subset (Khanna et al.)———

Reference works 2

  • Dictionary of American Family Names
  • Wikidata name items (native-script + romanized given/family names)

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

Is Loucas a male or female name?
Loucas 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 Loucas have the most bearers?
In Brazil, the national register counted about 1.3 million people named Lucas, more than in any other country we hold.
Where is Loucas most common?
No national register we hold counts the spelling Loucas itself. The densest figure for its family of spellings is Czechia's: the national register counts about 1 in 52 people named Lukáš.
How common is the name Loucas?
In Brazil, the national register counted 1,341,525 people named Lucas in 2022, about 1 in 158 residents.
How common is Loucas compared with other names?
In Brazil, Loucas is the 19th most common given name of 474,894 given names recorded there.

What do you want to know about Loucas?

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

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, “Loucas” — the 19th most common given name in Brazil. Data snapshot 2026-10-10.

See how Loucas parses inside a full name →