Assuming you’re talking about Chinese pronunciation, then the former one is the correct way. “Ching”, depending on its tone, can be written and pronounced in numerous Chinese letters, like “青” (qīng, blue) “情” (qíng, affection) “請” (qǐng, please) or “慶” (qìng, celebrate). However, there isn’t such pronunciation as “king” in Chinese (at least in Mandarin, not sure about Cantonese), nor can it be written in any character.
Hope this info helps. 