Petra and Christiana! . So funny that you mention that, because I’m seriously considering Adele Petra Christiana for my list!
I love Petra big time, but I would say I love Peter equally (my first favorite boys’ name!). I like Christian but I do slightly prefer Christiana, and much prefer Christa and Christiana to Christopher/Christophe, but vastly prefer those to Christina/Christine. I do find Christos intriguing though…