Ruïz
surname · Latin script
Recorded as a male name· opposite-gender records fall within measured source noise
Ruïz is a surname written in the Latin script, with more bearers in Spain than in any other country, where it is the 11th most common surname. Recorded meaning: From Ruy + -ez.
- NINicaragua≈1 in 93(inferred from the name graph)
- PYParaguay≈1 in 123
- ESSpain1 in 136
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.
- Spain (measured from records)
- #93 (measured from records)
- 3 (measured from records)
- Sources
- 528 (measured from records)
- ≈1 in 93 (inferred from the name graph)
366,644 people
of 19M surnames
recorded for this name
Highest-authority source
Nicaragua, est.
measured from records inferred from the name graph
Spellings & scripts(measured from records)
Locally spelled Ruiz in US United States, AR Argentina, PE Peru and 4 more and Rüïz in CR Costa Rica.
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 Ruy + -ez.
Sources 2
- Wiktionary
- Encyclopedia of surnames [the complete companion to tracing your names history]
Attested across 21 languages in the etymology graph.
Where in the world(measured from records)
Ruïz 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 | ||||
|---|---|---|---|---|---|---|
| ES Spain | #11 | 366,644 | 1 in 136 | 367K | Ruiz | 293 |
| US United States | #85 | 238,234 | 1 in 1.4K | 238K | Ruiz | 528 |
| AR Argentina | #12 | 232,729 | 1 in 195 | 233K | Ruiz | 167 |
| CO Colombia | #22 | ≈210,000 est. | ≈1 in 239 | 128 | Ruiz | 216 |
| PE Peru | #24 | ≈150,000 est. | ≈1 in 213 | 329K | Ruiz | 149 |
| NI Nicaragua | #7 | ≈67,000 est. | ≈1 in 93 | — | Ruiz | 93 |
| PY Paraguay | #15 | ≈58,000 est. | ≈1 in 123 | — | Ruiz | 89 |
| CR Costa Rica | — | 35,138 | 1 in 145 | 35K | Rüïz | 123 |
366,644 people counted by INE — Padrón per-token widgets (current living counts, given + apellidos). 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; RENAPER — Apellidos (person counts, national); the pe-reniec-name-freq register; INE — Padrón per-token widgets (current living counts, given + apellidos); INE — Apellidos más frecuentes (Padrón Municipal); the co-datosgov-candidates register; TSE — electoral roll (padrón) 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).
Evidence(measured from records)
No register attests this spelling yet
Register rows as of the 2026-10-09 data build.
Frequently asked questions
- What does the name Ruïz mean, and where does it come from?
- From Ruy + -ez. Recorded by Wiktionary and Encyclopedia of surnames [the complete companion to tracing your names history].
- In which country does Ruïz have the most bearers?
- In Spain, the national register counted about 367 thousand people named Ruïz, more than in any other country we hold, where it is most often spelled ruiz.
- How common is the name Ruïz?
- In Spain, the national register counted 366,644 people named Ruïz, about 1 in 136 residents.
- How common is Ruïz compared with other names?
- In Spain, Ruïz is the 11th most common surname of 395,154 surnames recorded there.
What do you want to know about Ruïz?
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/ru%C3%AFzThe 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, “Ruïz” — the 11th most common surname in Spain. Data snapshot 2026-10-10.