Re: Protasia and Jesuslina
I assume Protasia is after the saint. There's a bunch of (very rare, old) spellings of it in various usages like Pretiosia in English, Protazja in Polish, Protaise in French. I guess South African usage would be related to Dutch, since BtN lists that spelling as primarily Dutch and Portuguese...
Protasius is patron saint of Milan, along with his twin Gersavius. Their feast day is in June (in Western Catholic tradition), and they're invoked for protection against thieves. Their parents are also saints. They were a wealthy family from Milan, all killed for being Christian, supposedly during the reign of either Marcus Aurelius or Nero.
A Greek Orthodox icon of the Virgin Mary also comes up when I google, that includes the phrase Panagia – Fovera Prostasia (which gets translated as "All Holy - Great Protection").