Juliet is a feminine given name, an English form of the Italian Giulietta, which is a diminutive form of Italian Giulia.
It is also an English form of the French Juliette, which is a diminutive form of the French Julie.
All forms of the name are ultimately derived from the Latin Julia, a name which originated with the Julia gens of Ancient Rome.
The name is best known in the Anglosphere as the tragic heroine of Romeo and Juliet by William Shakespeare.
[1] Juliet has seen regular use for girls born in both the United Kingdom and the United States.