Kim comes from the hanja character for gold, which is pronounced more like 'geum'. This is why 'geum' is gold in modern Korean but the surname itself means gold owing to its origins. Apologies for the lack of a hangeul keyboard.
Moreover, 4 famous people with this surname are Kim Junmyeon, Kim Minseok, Kim Jongin, and Kim Jongdae from the boyband Exo, give them a listen.
― Anonymous User 4/30/2019
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3 famous bearers of this name are Kim Namjoon, Kim Seokjin and Kim Taehyung of the South Korean boyband BTS.
― Anonymous User 2/3/2019
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I'm not quite sure where 김 came from, unfortunately, but 금 is the character that means gold in Korean, and it's a different syllable entirely. Did it become 김 over time? I couldn't say, because I don't have the documentation to prove it one way or the other.