US Popularity Rank: 921

Origin: Irish

Meaning: Curly-haired

Though it means “curly-haired,” plenty of straight-haired or no-haired babies are given the name Cassidy. With Irish origins, this once more common surname comes from Ó Caiside, meaning "son of Caiside" to English speakers. As is often the case, a gender-neutral name can be dominated by one gender. In the case of Cassidy, it’s the girls who come out as winners. Whether you’re having a girl or a boy, Cassidy is a fabulous name, especially for those who have Irish roots.