[jph00]

q and ch both exist in pinyin, and have different sounds. The q sound requires placing the tip of the tongue on the teeth, and isn’t an initial consonant we have in English, so we don’t have a way to spell it.

[stavros]

Ahh, I see, so it's not "Chian", it's "Tsian"?

[BigTTYGothGF]

'q' is alveolar: https://en.wikipedia.org/wiki/Alveolar_consonant. In Wade-Giles it would be "Ch'ian".