现代韩国汉字“金”字有两个韵:-im和-im。前者一般用于姓,后者一般用于和金属有关的事物,在地名上这两个韵都使用。前者可能反映汉语中古音,后者是汉语上古音。根据历史纪录,新罗金氏的始祖跟金子有关系,因此他开始姓金。但是如果从金子得到了这个姓,金姓应该要反映和金子一样的音,事实是这两个音有差别。不但姓,不少韩国地名也有这样的情况。这原因暂不清楚。本文认为金姓的“金”音是外来移民带来的,他们迁入新罗以后成为高层阶级。在这样的情况下,其他的语音现象没有受到全面的影响,所以*-im>-im的全面扩散也没有发生。 Modern Korean characters “gold” have two rhymes: -im and -im. The former is generally used for surnames, while the latter is generally used for things related to metals. Both rhymes are used in place names. The former may reflect the ancient Chinese sound, while the latter is the Chinese ancient sound. According to historical records, the ancestor of Silla Jin’s was related to gold, so he began to surname Kim. But if the surname was obtained from gold, the gold surname should reflect the same tone as gold. The fact is that these two notes are different. Not only the surname, but also many places in South Korea have such a situation. This is not clear. This article believes that Jin’s “Gold” sound was brought by foreign immigrants and that they moved into Silla to become a higher class. Under such circumstances, other speech phenomena have not been fully affected, so the full spread of *-im>-im has not occurred.