Ton-That () and Tôn Nữ (for female) is a two-character Vietnamese compound surname, originating from the Nguyễn dynasty. It is the surname for members of the imperial family that were not direct first-born descendants of the Emperor, and therefore considered collateral relatives of the Nguyễn dynasty.
This surname was originally Tông Thất (), which is derived from a Sino-Vietnamese word, meaning "clan members" or "royal family members". The surname was changed to Tôn Thất () after Thiệu Trị (né: Nguyễn Phúc Miên Tông) became the emperor due to naming taboo.
Notable people Tôn Thất Đính (1812–1893), Nguyễn Dynasty mandarin Tôn Thất Thuyết (1839–1913), Nguyễn Dynasty regent Tôn Thất Xứng (1923–2018), South Vietnamese general Tôn Thất Thiện (1924–2014), South Vietnamese nationalist Tôn Thất Đính (1926–2013), South Vietnamese general Tôn-Thất Tiết (born 1933), music composer Tôn Nữ Thị Ninh (born 1947), Vietnamese diplomat and educator Tôn-Thất An (born 1970), music composer Hoan Ton-That (born 1988), Vietnamese-Australian programmer/entrepreneur
See also Nguyễn Nguyễn dynasty
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