Ithell sounds and looks strange. At first glance, I though it was ith-EL, which I prefer - it sounds like the name of some Babylonian goddess. Unica looks like a brand name, I want to pronounce it OO-nee-tsa.
masculine list:
https://www.behindthename.com/pnl/191050/124079feminine list:
https://www.behindthename.com/pnl/191050/124080