Shammu was born Sheerin Sharmilee in Bikaner, Rajasthan to a Tamil Hindu family that hails from Neyveli. Her family moved to the US and her father, Rajaram Ramalingam, works as a computer consultant whilst her mother is a housewife. She had been studying at Cypress Creek High School in Orlando, Florida, but quit school to appear in films. Despite starting a film career, Shammu finished her high school courses through online classes. Her younger sister has appeared in Mayilu, as the younger version of Shammu's character.[1]
