Think about it when sakura gave birth to sadara and sasuke would stand next to here holding here hand? That would never happend so i think sadara is the name of one of sakura's grandparents or a family member.
Sarada (サラダ) is the Japanese pronunciation of the Portuguese word "salada". Her name is also derived from Saraswati, the Hindu goddess of knowledge. It is also the name of Sarada Devi; wife and spiritual counterpart of Ramakrishna.
Could be a reference to this...though, wouldn't look good for those who want her to be purely battle oriented.
Saraswati, sometimes spelled Sarasvati, is a Sanskrit fusion word of Sara (सार)[9] which means essence, and Sva (स्व)[10] which means one self, the fused word meaning "essence of one self", and Saraswati meaning "one who leads to essence of self knowledge".[11][12] It is also a Sanskrit composite word of surasa-vati (सुरस-वति) which means "one with plenty of water".
The word Saraswati appears both as a reference to a river and as a significant deity in the Rigveda. In initial passages, the word refers to Sarasvati River and mentioned with other northwestern Indian rivers such as Drishadvati. Saraswati then connotes a river deity. In Book 2, Rigveda calls Saraswati as the best of mothers, of rivers, of goddesses
Saraswati is celebrated as a feminine deity with healing, purifying powers of abundant, flowing waters in Book 10 of Rigveda