Giai is a Vietnamese given name and an Italian surname originated in the region of Piedmont. Notable people with the name include:
Given names
edit- Đỗ Kế Giai (1929–2016), South Vietnamese major general
- Đỗ Quang Giai (1900–1972), South Vietnamese senator
- Vũ Văn Giai (1934–2012), South Vietnamese general
Surnames
edit- Cristina Giai Pron (born 1974), Italian slalom canoeist
- Giovanni Antonio Giai (also spelled as Giay) (1690–1764), Italian composer
- Maria Clara Giai Pron (born 1992), Italian slalom canoeist, younger sister of Cristina