I have a friend and her name is "Aischa" and we were wondering how to type her name in korean?

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I'm not sure the exact prononciation, but I guess "아이쉬아" because 'sch' is pronounced as 쉬.

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My turn!  "애이시아"

That's if the "ai" is pronounced "ey" as in "they". If it's pronounced like "eye" then it'd be "아이시아".

It's always a rough approximation. My common name has about 3 possible spellings in Korean.

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If it is pronounced as in french, it should be 아이샤

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i think 아이자 is as close as you will get, depending on how Aischa is pronounced.