What is the ruling on a mak nyah (male-born transgender person) changing to a female alias, and does calling them by that name mean accepting the mak nyah community?

Summary

Men imitating women, as mak nyah do, is forbidden, and changing a male name to a female name serves no benefit and carries negative legal implications. A female alias for a mak nyah is regarded as a false title because the person is in reality male, and it falls under the prohibition of disgracing oneself and using bad nicknames. Muslims are encouraged to give good names suited to one's sex, and to prevent such imitation as far as able, by action, then speech, and finally by disliking it in the heart.

Written in our own words from the original fatwa — check the source before acting on it.