Borrowed from Vietnamese Cần Thơ.
Cần Thơ
Municipalities: Cần Thơ · Da Nang · Hanoi · Haiphong · Hue · Ho Chi Minh City |
Provinces: An Giang · Bắc Ninh · Cà Mau · Cao Bằng · Đắk Lắk · Điện Biên · Đồng Nai · Đồng Tháp · Gia Lai · Hà Tĩnh · Hưng Yên · Khánh Hoà · Lai Châu · Lạng Sơn · Lào Cai · Lâm Đồng · Nghệ An · Ninh Bình · Phú Thọ · Quảng Ngãi · Quảng Ninh · Quảng Trị · Sơn La · Tây Ninh · Thái Nguyên · Thanh Hoá · Tuyên Quang · Vĩnh Long |
Unknown. One theory proposes that this is a corruption of Cầm Thi in Cầm Thi Giang (literally “river of poems”), a poetic name given by Gia Long for a river nearby. Another legend has it that this is a combination of rau cần (“water dropwort”) + rau thơm (“mint”), both products of the Cần Thơ area in ancient times.
The suggestions above are both certainly folk etymologies. The Cần in placenames almost always reflects a presyllable of the shape kVN- in Khmer (where N is a nasal), compare Cần Giờ (from Khmer កញ្ជើ (kɑñcəə)), Cần Giuộc (from Khmer កន្ទួត (kɑntuət)), Cần Vọt/Cần Bột (from Khmer កំពត (kɑmpɔɔt)). Still, it is not known which specific Khmer item Cần Thơ was borrowed from.