Sissy

Sissy is an English given name that originated as a pet form or diminutive of Cecilia or similar names beginning with the Sis- sound, ultimately tracing back through Cecilia to the Latin family name Caecilius, derived from the Latin root caecus meaning blind. It has also functioned as a general affectionate nickname for a sister, gradually passing into use as an independent given name. The name gained cultural visibility through figures such as Sissy Spacek, the American actress. Related forms include Cecilia, Cecily, and Cissie.