Tremaine is a Cornish language name, though, most often a surname.

Surname

• F. Orlin Tremaine, science fiction editor
• Emily Hall Tremaine, art director and collector
• Jeff Tremaine, film and television producer
• Marilyn Tremaine, computer scientist
• Morris S. Tremaine, NYS Comptroller (1927–1941)
• Scott Tremaine, astrophysicist

Given name

• Tremaine Edmunds, American football player
• Tremaine Fowlkes, basketball player
• Trey Songz, was born Tremaine Aldon Neverson

Fictional people

• Lady Tremaine, character in the 1950 film Cinderella
• Nancy Tremaine, a character in the 2007 Disney film Enchanted
• Prescott Tremaine, character from David Weber's "Honorverse" series of novels
• Tremaine Gidigbi, character from the television series Footballers' Wives
• Lord Robert Tremaine of Barham, character from the novel "The Masqueraders" by Georgette Heyer
• Tremaine Valiarde, a main character from the "Fall of Ile-Rien" trilogy by Martha Wells