Loos
surname · Latin script
Meaning, in English: from Loose (Kent) or Lose (Suffolk); first attested Stephen, William de Lose 1200 P (Suffolk)
Recorded for both men and women· direction only, no split published
/luːz/(machine-generated) pronunciation, model-generated
Loos is a surname written in the Latin script, with more bearers in the United States than in any other country, where it is the 55th most common surname.
- CHSwitzerland1 in 735as Roth(measured from records)
- NZNew Zealand≈1 in 868as Ross
- CACanada≈1 in 1.1Kas Ross
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 Loos 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)
- #237 (measured from records)
- 7 (measured from records)
- Sources
- 608 (measured from records)
- 1 in 561 (inferred from the name graph)
229,368 named Ross, 2010
of 19M surnames
recorded for this name
Highest-authority source
Ecuador, as Lucas
measured from records inferred from the name graph
Spellings & scripts(measured from records)
Locally spelled Ross in US United States, CA Canada, NZ New Zealand, Luke in GB United Kingdom, AU Australia, NG Nigeria, Luca in IT Italy, CH Switzerland and Roth in DE Germany.
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(measured from records)
from Lohse; also associated with 'mutwillig, lose'
Sources 1
- Deutsche Namenkunde: Unsere Familiennamen nach ihrer Entstehung und Bedeutung
Attested across 2 languages in the etymology graph.
How Loos is read(measured from records)
Loos is one spelling over 3 language communities, and the dictionaries record it differently in 2 of them. Each row is what a source recorded for that language, beside the share of this name’s records the language holds. No single row is the name’s meaning.
- English56%
from Loose (Kent) or Lose (Suffolk); first attested Stephen, William de Lose 1200 P (Suffolk)
as a nameA Dictionary of English Surnames
- German20%
from Lohse; also associated with 'mutwillig, lose'
as a nameDeutsche Namenkunde: Unsere Familiennamen nach ihrer Entstehung und Bedeutung
- French6.2%
No dictionary in our sources glosses Loos in French.
The share is ours — how much of this name’s records each language holds. The sense beside it is the source’s, quoted and credited, including where it names a gender. We do not publish a gender of our own per language: our records carry one figure for the spelling as a whole.
Where in the world(measured from records)
Loos 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 | #55 | 229,368as Ross | 1 in 1.4K | 267K | Ross | 608 |
| NG Nigeria | — | ≈74,000 est. | ≈1 in 2.9K | — | Luke | 75 |
| DE Germany | #30 | ≈59,000 est. | ≈1 in 1.4K | listed | Roth | 235 |
| GB United Kingdom | #67 | ≈57,000 est. | ≈1 in 1.2K | 2.8K | Luke | 360 |
| IT Italy | #69 | ≈55,000 est. | ≈1 in 1.1K | 5 | Luca | 305 |
| CA Canada | #34 | ≈36,000 est. | ≈1 in 1.1K | 139 | Ross | 295 |
| EC Ecuador | — | 30,159as Lucas | 1 in 561 | 30K | Luque | 36 |
| AU Australia | #64 | ≈23,000 est. | ≈1 in 1.1K | 353 | Luke | 348 |
| CH Switzerland | #20 | 11,430as Roth | 1 in 735 | 11K | Luca | 139 |
| NZ New Zealand | #49 | ≈5,700 est. | ≈1 in 868 | 75 | Ross | 165 |
229,368 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: Census Bureau — Surname Frequency 2010; Census Bureau — First Name Frequency 2020 by sex; ONS — Baby names England and Wales (2024); ISTAT — Contanomi newborn per-name series (1999–2024, JSONP backend); Australian national given names (aggregated state BDM); the dfa-band-1 register; Alberta Open Government — Frequency and Ranking of Baby Names by Year and Gender; INEC — civil registry names; DIA — Baby name popularity (1900–present); 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 recorded senses(measured from records)
Loos is also recorded in 4 other lexicons, as a different name or as an ordinary word. These are senses of the spelling, not of the name above.
nickname from the adjective loos ‘cunning’, ‘artful’, ‘guileful’.
as a nameDictionary of American Family Names
habitational name from any of several places called Loose or Loosey.
as a nameDictionary of American Family Names
from a short form of Nikolaus, German form of Nicholas.
as a nameDictionary of American Family Names
In Dutch, blank, empty
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)
- Adolf Loosb. 1870ATAustrian and Czech architect and art collector (1870-1933)
- Lina Loosb. 1882ATAustrian actor and author (1882-1950)
- Theodor Loosb. 1883DEGerman actor (1883-1954)
- Anita Loosb. 1889USAmerican screenwriter, playwright, author, actress and television producer (1888-1981)
- Valentin Loosb. 1895CZCzech ice hockey player (1895-1942)
- Elsie Altmann-Loosb. 1899ATAustrian actor and autobiographer (1899-1984)
- Claire Beck Loosb. 1904CZCzech writer and photographer
- Mary Loosb. 1910USactress, screenwriter and novelist (1910-2004)
- Bernhard Loosb. 1955DEGerman politician
- Anna Loosb. 1970DEGerman actress and singer
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)
Evidence(measured from records)
Attested in 33 sources across 19 countries.
| Country | Register | Year | Count | Rank |
|---|---|---|---|---|
| US United States | Census Bureau — Surname Frequency 2000 | 2000 | 4.2K | #7,289 |
| US United States | Census Bureau — Surname Frequency 2010 | 2010 | 4.1K | #8,159 |
| US United States | Census Bureau — Surname Frequency 2020 | 2020 | 3.9K | #8,071 |
| CH Switzerland | BFS — Familiennamen der Wohnbevölkerung (surnames) | 2024 | 101 | #10,978 |
| EC Ecuador | INEC — Visualizador de Nombres y Apellidos, per-token query API (1900–2024) | 2007 | 1 | — |
| EC Ecuador | INEC — Visualizador de Nombres y Apellidos, per-token query API (1900–2024) | — | 1 | — |
| DE Germany | Deutscher Familiennamenatlas Band 1 | — | — | — |
| US United States | wru Name Dictionary — US surnames, Census 2010 subset (Khanna et al.) | — | — | — |
Reference works 5
- Dictionary of American Family Names
- The Oxford Dictionary of Family Names in Britain and Ireland
- Nederlandse FamilienamenBank (Dutch surname bank; ex-Meertens Instituut, now CBG)2007
- Wikipedia surname tokens
- 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
- Where does the name Loos come from?
- from Lohse; also associated with 'mutwillig, lose' Recorded by Deutsche Namenkunde: Unsere Familiennamen nach ihrer Entstehung und Bedeutung.
- How do you pronounce Loos?
- A machine transcription gives /luːz/ (IPA) for English.
- What does the name Loos mean?
- In English, from Loose (Kent) or Lose (Suffolk); first attested Stephen, William de Lose 1200 P (Suffolk)
- In which country does Loos have the most bearers?
- In the United States, the national register counted about 229 thousand people named Ross, more than in any other country we hold.
- Where is Loos most common?
- No national register we hold counts the spelling Loos itself. The densest figure for its family of spellings is Ecuador's: the national register counts about 1 in 561 people named Lucas.
- How common is the name Loos?
- In the United States, the national register counted 229,368 people named Ross in 2010, about 1 in 1.4 thousand residents.
- How common is Loos compared with other names?
- In the United States, Loos is the 55th most common surname of 6,282,806 surnames recorded there.
What do you want to know about Loos?
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/loosThe 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, “Loos” — the 55th most common surname in United States. Data snapshot 2026-10-10.