Jessica=杰西卡 也很好啊。沙用于女姓名是用这个莎，寇静莎

寇静沙 is a great option. Although, we usually translate Jessica to 杰西卡。

我觉得你可以用这个相似的姓“柯”，比较好听。 这些名字都不错: 柯静茜 柯静熙 柯静曦 柯静夕 柯静惜 (还可以把“静”换成“婧”)

Definitely don't use the ones containing 洁爽, which sounds like a feminine hygiene product. 康静莎 is the best IMHO. Changing 沙 to 莎 for girls. The 艹 top that looks like small grasses means plants, and characters with that top part are usually used for girl names. Looks more beautiful.

I feel that 寇静沙 sounds good.