We have a Rebecca in this office. Actually, her name is Changqing, and that's what all of us call her, but there does seem to be thing for Chinese people to adopt a 'Western' name as well, so hers is Rebecca.

(Her main concession to us clueless westerners is to not insist on surname firstname ordering. FWIW, she's a Mandarin speaker, not Cantonese, so I can't use her as an example of HKers.)