Can a single consonant (辅音) ever be used in transliteration? Listening to Kylian Mbappé’s Chinese surname:


  姆巴佩


Always makes me wonder why 姆 is even part of his name.

The English (read: French) pronunciation seems a lot closer to something like:


  呣 


A single consonant (辅音) pronounced in different tones of:


  m


Would it ever be acceptable to put a single consonant into a transliteration?

I’ve never come across such a case, so I wouldn’t imagine that it is okay. But how come?
No.

A normal syllable always has a vowel inside. The syllables like 'n', 'ng', 'm' are very special and have very limited use. They would not appear in transliteration.