Re: Asking someone if they have a Chinese name

Using「呀？」as a final particle in a question is kind of blunt,

Using 呀 is not blunt or assertive. In fact, 呀 is a ‘softening’ particle used on most occasions to soften a blunt question/statement. 你有冇中文名 is blunt without the final particle 呀.
On the other hand, 呢 is an ‘interrogative’ particle used here to lay focus on the subject matter of 中文名 rather than for softening bluntness.