Kasai
loc · Latin script
Meaning: in the Tokyo area and the Ryukyu Islands, the name is written with characters meaning ‘bamboo hat’ and ‘weir
Recorded for both men and women· direction only, no split published
Kasai is a name written in the Latin script, most frequently recorded in Japan.
- JPJapan
Where the name is found, darker where our sources hold more of it. No national register counts its bearers anywhere we hold data, so the map carries no figures. One hue, darker where it is more common; hover a country for its figure.
- Japan (inferred from the name graph)
- Sources
- 109 (measured from records)
no count published
Highest-authority source
measured from records inferred from the name graph
Spellings & scripts(measured from records)
One other spelling is counted as the same name:
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)
in the Tokyo area and the Ryukyu Islands, the name is written with characters meaning ‘bamboo hat’ and ‘weir. In western Japan, and in the name of a village east of Tokyo, it is written with characters meaning ‘west of the river’, and this latter is pronounced Kawanishi by some. Other variants exist as well.
Sources 1
- Dictionary of American Family Names
Attested across 2 languages in the etymology graph.
Where in the world(measured from records)
Kasai counted together with the spellings and other-language forms grouped with it. Where a register counted another spelling, the row names it.
| Country | Most common spelling | Sources | ||
|---|---|---|---|---|
| JP Japan | — | listed | Kasai | 105 |
| US United States | — | 437 | — | 109 |
| BR Brazil | — | 303 | — | — |
| IN India | — | 39 | — | 8 |
| PL Poland | — | 17 | — | — |
| CH Switzerland | — | 11 | — | 4 |
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: SSA — National Baby Names (1880–present); IBGE — Censo 2022 Nomes no Brasil per-token lookup (v3 API, given+surname); Instate — India surnames (clean spellings) from electoral rolls; dane.gov.pl — PESEL living persons (surnames); BFS — Familiennamen der Wohnbevölkerung (surnames); the japanese-names-oneill-1972 register. 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)
Kasai is also recorded in 5 other lexicons, as a different name or as an ordinary word. These are senses of the spelling, not of the name above.
In Czech, nickname for a weak person, someone who was bullied, from kasal ‘bullied’, passive of kasat se ‘to bully’ (see Kasa).
as a nameDictionary of American Family Names
In English, river, region. Senegal
as a namePronouncing Dictionary of Proper Names
In English, Kasamansa [Casamance]
as a namePronouncing Dictionary of Proper Names
In English, river, Africa
as a namePronouncing Dictionary of Proper Names
In jpx-pro, spool, tool for spinning, spool string
as a wordStarLing Tower of Babel etymological databases (Starostin et al.)
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)
- Zenzō Kasaib. 1887JPnovelist
- Masae Kasaib. 1933JPJapanese volleyball player (1933–2013)
- Yoshiyuki Kasaib. 1940JPJapanese businessman (1940-2022)
- Kimiko Kasaib. 1945JPJapanese singer
- Akira Kasaib. 1952JPJapanese politician
- Shinsuke Kasaib. 1963JPJapanese announcer
- Yoriko Dōguchib. 1965JPnot in their usual nameJapanese actress (1965-)
- Noriaki Kasaib. 1972JPJapanese ski jumper
- Sui Kasaib. 1984JPJapanese mangaka
- Tomomi Kasaib. 1991JPJapanese female talent, singer, YouTuber, businessperson (1991-)
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 24 sources across 12 countries.
| Country | Register | Year | Count | Rank |
|---|---|---|---|---|
| US United States | Census Bureau — Surname Frequency 2000 | 2000 | 380 | #51,458 |
| US United States | Census Bureau — Surname Frequency 2010 | 2010 | 349 | #58,182 |
| US United States | Census Bureau — Surname Frequency 2020 | 2020 | 336 | #64,041 |
| BR Brazil | IBGE — Censo 2022 Nomes no Brasil per-token lookup (v3 API, given+surname) | — | 303 | #26,172 |
| IN India | Instate — India surnames (clean spellings) from electoral rolls | — | 39 | #52,018 |
| PL Poland | dane.gov.pl — PESEL living persons (surnames) | 2026 | 17 | — |
| PL Poland | dane.gov.pl — PESEL living persons (names) | — | 17 | #98,704 |
| IN India | Instate — India surnames by state (real counts) from electoral rolls | — | 17 | #69,645 |
| PL Poland | dane.gov.pl — PESEL living persons (surnames) | 2026 | 16 | — |
| PL Poland | dane.gov.pl — PESEL living persons (names) | — | 16 | #102,102 |
| CH Switzerland | BFS — Familiennamen der Wohnbevölkerung (surnames) | 2024 | 11 | #56,728 |
| JP Japan | Japanese Names (O'Neill, 1972) | — | — | — |
Reference works 4
- Dictionary of American Family Names
- 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
- What does the name Kasai mean, and where does it come from?
- in the Tokyo area and the Ryukyu Islands, the name is written with characters meaning ‘bamboo hat’ and ‘weir. Recorded by Dictionary of American Family Names.
- In which country does Kasai have the most bearers?
- Kasai is most frequently recorded in Japan, where it is most often spelled kasai.
What do you want to know about Kasai?
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/kasaiThe 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, “Kasai”. Data snapshot 2026-10-10.