It'll just be how they pronounced
Candace, which you can click on. We make it two syllables today because we're used to words having a silent -e on the end, but in the ancient languages every letter counted! If the original
Candace saw her name spelt
Candice and pronounced Kandiss, she would never have recognised it. (Originally it would have been Kan-da-ke, but let's not overdo things.)