There are multiple origins and meanings for the name Ciara:
1. Derived from the Irish word (ciar) meaning - "dark"
2. Form of the given name Cera (St Ciara)
3. Form of the personal name Sarah/Sara - "lady; princess; mistress".
Holy Ciara (d. C. 680) - Irish Maid, the Catholic Saint. Name-day; October 16, Jan. 5