Sia

Sia is an English given name that originated as a short form of names beginning with the syllable Si, most commonly Sienna or Siobhan, though it has also been used as a diminutive of Anastasia. Its rise as a standalone name gained momentum in the late twentieth and early twenty-first centuries, partly through the influence of the Australian singer and songwriter Sia Furler, who performs under the single name Sia. Related forms include Siya and the longer names from which it derives.