See https://github.com/keystonejs/keystone/issues/1366#issuecomment-99640365 The [Royal Thai General System of Transcription](http://en.wikipedia.org/wiki/Royal_Thai_General_System_of_Transcription) seems to be the most suitable form of transliteration.
See keystonejs/keystone#1366 (comment)
The Royal Thai General System of Transcription seems to be the most suitable form of transliteration.