Thi is a unisex given name of Vietnamese origin, derived from Sino-Vietnamese. It means "sapphire" in Vietnamese and is often used to refer to the precious gemstone. In Vietnamese culture, Thi is considered one of the five noble virtues along with Humanity (Ý), Righteousness (Đạo), Propriety (Lễ), and Wisdom (Trí). The name Thi has been traditionally bestowed upon individuals of high moral character and integrity in Vietnam.
These statistics show a wide fluctuation in the number of babies named Thi born annually over the past four decades, with peaks as high as 20 births in 1982 and 16 births in 2007, and troughs as low as 5 births in multiple years. The total number of Thi births over this period is 408.