Another vote for Gemma/Jemma here. Christina is one of those names that falls under the Damien/Shaun categories for me, one of those popular 70/80's names that was overdone if that makes sense? No offence to anyone here who has a Christina/Damien/Shaun. Im very much one for you choose what YOU like, so if you love Christina then go for it, this is merely my opinion and in the grand scheme of your name choosing, my opinion doesnt matter