it's american/english thing. in most languages, you read things exactly as you write them. But in English e is sometimes e, sometimes i, sometimes ey....god! You can go crazy
I literally don't know what you're trying to communicate by "'ehy-sehy-ka" or 'ahy-sehy-kahy'. I only somewhat assume that "h" are mute there. Write this in hiragana or the phonetic alphabet.