Autonym Font
The following table in this page uses the Autonym font for displaying language names without font issues.
Version: 20131118
with 486 languages and citing
423 tokipona Toki Pona
http://metabattle.com/wiki/extensions/UniversalLanguageSelector/tests/autonym.html
I'm not sure if the capital letters are to be considered as autonym for TP, but this list is about AUTONYM FONTs whatever that is ...