卡辛

卡 (kǎ) is the standard 'ka/ca' phonetic across foreign names (卡尔 Carl, 卡门 Carmen) and 辛 (xīn) covers 'sin/cyn/sen/xin'. Together they're a flexible match for English names like Kasin, Cassin, or Kassin and could also surface as part of longer transliterations.

usage

Most often appears as a character name in dubbed films or translated novels. Without more context, treat it as a phonetic transliteration rather than a specific known person.