It could be a:
* Misspelling of a word: It might be a misspelling of "kish," which could refer to a type of pastry or a small island.
* Nickname or made-up name: It could be a shortened form of a name like "Kiesha" or "Kishi," or simply a unique name someone has chosen.
To clarify the spelling, you'd need more context. What's the situation where you encountered this spelling?