Wu commonly represents Chinese 吳/吴, pronounced Wú in Mandarin and associated with the ancient state of Wu. It is best explained as a geographical surname rather than given a single English translation. However, Wu in Roman letters can also represent distinct characters such as 武 and 伍. Recovering the character is the first step toward choosing the right explanation. FamilySearch's Chinese surname finder, 吳/吴; Oxford surname dictionary, Wu.
What 吳/吴 Means
吳 is the traditional form; 吴 is the simplified form of the same surname. Taiwan's Ministry of Education gives the reading wú and distinguishes several uses of 吳: an ancient state, later political entities, a geographical name associated with Suzhou and Jiangsu, and a surname. Its older verbal sense concerns speaking loudly. These dictionary senses should not be treated as interchangeable surname origins. Ministry of Education, 吳.
The Dictionary of American Family Names also gives an ancient gloss of “big, large,” but explains surname formation through place-names. A word's historical vocabulary meaning and the reason a family acquired it are different questions. Calling every Wu family “large” would obscure the geographical explanation. Oxford surname dictionary, Wu.
From a State Name to a Family Name
The Oxford dictionary records a tradition connecting 吳 with the state associated with Tai Bo in present-day Jiangsu: after Yue conquered it in 473 BC, inhabitants adopted its name. It also records a separate derivation from 虞, Yu, in present-day Shanxi, through ancient similarity of pronunciation. Oxford surname dictionary, Wu.
The conquest date belongs to the historical explanation; it is not a documented starting date for every hereditary Wu line. Neither the state's existence nor a tradition about its founder supplies a continuous pedigree. For an individual family, evidence of inheritance means connected generations using the name, with enough identifying information to establish the relationships.
Also distinguish the early state from later kingdoms called Wu. The Ministry of Education lists the Three Kingdoms polity and the Five Dynasties-era state separately from the Zhou-period state. Finding “Wu” in a historical text therefore does not necessarily identify either the surname or the place involved in its formation. Ministry of Education, 吳, numbered definitions.
Other Surnames Written Wu
The Oxford entry distinguishes 武, with military meanings and personal-name or posthumous-title traditions; 伍, glossed as five, with personal-name traditions; 巫, with divinatory occupations among its explanations; and 鄔, derived from fief names. Some accounts invoke legendary antiquity. Oxford surname dictionary, Wu.
These are separate surnames, not interchangeable spellings of 吳. In particular, the military sense of 武 does not explain a family whose documents say 吳. A legendary ancestor is an origin tradition to identify as such, not an early birth record. The examples here are not an exhaustive inventory of every character that can appear as Wu.
Wu, Ng, and Goh in Family Records
FamilySearch's Chinese surname finder lists Wu for Mandarin 吳/吴, Ng for Cantonese, Ng or N for Hakka, and other recorded forms including Goh, Ngu, and Eng. These are useful search possibilities tied to the written surname, rather than translations of its meaning. FamilySearch, 吳/吴 spelling table.
The mapping is not reversible from spelling alone. The same finder also lists Ng and Eng under 黃/黄, a different surname. Thus an Ng record cannot simply be relabeled Wu without corroboration. Nor does a Roman spelling establish a person's ethnicity or ancestral village.
For a proposed Wu–Ng connection, compare the original characters, relatives, residence, age, and migration chronology. Retain the spelling actually used in each source. A modern pinyin form can be a search aid without replacing the family's historical name. Our guide to testing related surname spellings explains how to document that comparison. Wang offers another example of why Roman letters can conceal different Chinese characters; the East Asian origin guide provides broader context.
Researching a Wu Family
Start with an identifiable person and work backward, keeping the character and locality alongside each Roman spelling:
1. Recover the written name. Photograph inscriptions, family papers, or documents containing Chinese text. Preserve the image as well as a transcription, so a doubtful character can be checked later. Do not infer 吳 solely because an English record says Wu. 2. Identify the locality precisely. Record the village, county or district, and province as written in each source. A broad connection to ancient Jiangsu does not establish where a recent ancestor lived. If a family genealogy is available, compare its named households and generations with independently identified relatives before extending the pedigree. 3. Search the names used in immigration records. For a U.S. branch, the National Archives warns that officials sometimes reversed family and personal names or indexed misheard forms. The name on the travel papers may differ from the person's usual name; Chinese writing can help verify an identification. 4. Follow the full case file. Chinese immigration files can contain family relationships, village maps, photographs, interrogation transcripts, and references to relatives' files. Use those links to distinguish candidates instead of relying on the surname alone. National Archives, Chinese immigration research guide.
That archival guide also describes coaching materials associated with “paper sons.” If a file presents a claimed relationship, compare it with other evidence rather than assuming every statement is biological genealogy. This is a record-specific issue to investigate when relevant, not a presumption about Wu families generally.
Record both a proposed connection and the evidence that could disprove it using the surname evidence checklist. A verified Chinese character can resolve the etymology while still leaving the family's earlier ancestry unknown.
References
- Patrick Hanks, Simon Lenarčič, and Peter McClure, eds. Dictionary of American Family Names, 2nd edition. Oxford University Press, 2022, entry Wu, reproduced by Ancestry.
- Taiwan Ministry of Education. Revised Mandarin Chinese Dictionary, 2021 edition, entry 吳, including the reading, historical word sense, and numbered proper-name definitions.
- FamilySearch. Chinese surname finder, undated, spelling tables for 吳/吴 and 黃/黄; accessed 7 September 2026.
- U.S. National Archives and Records Administration. Chinese Immigration and the Chinese in the United States: Records in the Regional Archives of the National Archives and Records Administration, Reference Information Paper 99, 1996; online research guide, sections on immigration case files and name identification; accessed 7 September 2026.