Rosby

surname · Latin script

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

Rosby is a surname written in the Latin script, with more bearers in the Central African Republic than in any other country.

rarermore common
  • USUnited States1 in 1.6M(measured from records)
  • CFCentral African Republic≈1 in 11K
  • SESweden1 in 352K

carrying the name, as counted by its national register where one exists and as Mondonomo estimates it elsewhere (marked ≈ and "est." on hover). One hue, darker where it is more common; hover a country for its figure.

Central African Republic (inferred from the name graph)

≈550 people, est.

Sources
139 (measured from records)

Highest-authority source

≈1 in 11K (inferred from the name graph)

Central African Republic, est.

measured from records inferred from the name graph

Name dossier (print, CSV)

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)

Rosby 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 Rosby is recorded, by country
CountryMost common spellingSources
CF Central African Republic#586≈550 est.≈1 in 11K—Rosby1
US United States—2061 in 1.6M206Rosby139
CA Canada—≈46 est.≈1 in 821K—Rosby26
GH Ghana—≈35 est.≈1 in 831K—Rosby3
GB United Kingdom—≈34 est.≈1 in 1.9M29Rosby32
SE Sweden—291 in 352K29Rosby9
DK Denmark—121 in 489K12——

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; Surnames of England and Wales (taliesin-arlein.net, Sept 2002 electoral register); Skatteverket — Sök hur många som har ett visst namn (living population); Danmarks Statistik — Hvor mange hedder...? (living-population name counts). 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)

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

  • Swedish surname4 spellings in the group

    Most recorded in Sweden, Denmark, United States, Canada

    Languages: Swedish, Norwegian, Danish

    Also written Rösby

31 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.

Evidence(measured from records)

Attested in 10 sources across 6 countries.

Official registers attesting Rosby
CountryRegisterYearCountRank
US United StatesCensus Bureau — Surname Frequency 20102010206#89,753
US United StatesCensus Bureau — Surname Frequency 20002000198#87,348
US United StatesCensus Bureau — Surname Frequency 20202020184#103,857
SE SwedenSkatteverket — Sök hur många som har ett visst namn (living population)—29#19,098
GB United KingdomSurnames of England and Wales (taliesin-arlein.net, Sept 2002 electoral register)200229#71,549
DK DenmarkDanmarks Statistik — Hvor mange hedder...? (living-population name counts)—12#35,100
US United Stateswru Name Dictionary — US surnames, Census 2010 subset (Khanna et al.)———

Reference works 1

  • 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

In which country does Rosby have the most bearers?
Mondonomo estimates about 545 people named Rosby in the Central African Republic, more than in any other country we hold, where it is most often spelled rosby.
How common is the name Rosby?
In the United States, the national register counted 206 people named Rosby in 2010, about 1 in 1.6 million residents.
How common is Rosby compared with other names?
In the Central African Republic, Rosby is the 586th most common surname of 1,109 surnames recorded there.

What do you want to know about Rosby?

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

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, “Rosby” — the 586th most common surname in Central African Republic. Data snapshot 2026-10-10.

See how Rosby parses inside a full name →