Tôn Thất (Ton That, often simplified to Tonthat in English-language text) is a two-character Vietnamese compound surname. The surname originating from Nguyễn.
Tôn Thất (Tôn Nữ for females): Surname for members of the Nguyễn Dynasty royal family that were not direct first born descendants of the Emperor.
Notable people
References
Tôn Thất Wikipedia(Text) CC BY-SA