I had the pleasure of working Stephen Nixon on adding Vietnamese diacritics to the latest expansion of his Name Sans. Nixon writes:
By popular demand, Vietnamese is now supported! Thanks to Donny Trương for his excellent resource on Vietnamese Typography, as well as for his specific review of the Vietnamese characters of Name Sans, which helped reveal some opportunities to make them more natural & unified. This was a push, but totally worth it for all the people it will enable to make use of Name Sans! This adds Áá Àà Ảả Ãã Ạạ Ăă Ắắ Ằằ Ẳẳ Ẵẵ Ặặ Ââ Ấấ Ầầ Ẩẩ Ẫẫ Ậậ Đđ Éé Èè Ẻẻ Ẽẽ Ẹẹ Êê Ếế Ềề Ểể Ễễ Ệệ Íí Ìì Ỉỉ Ĩĩ Ịị Óó Òò Ỏỏ Õõ Ọọ Ôô Ốố Ồồ Ổổ Ỗỗ Ộộ Ơơ Ớớ Ờờ Ởở Ỡỡ Ợợ Úú Ùù Ủủ Ũũ Ụụ Ưư Ứứ Ừừ Ửử Ữữ Ựự Ýý Ỳỳ Ỷỷ Ỹỹ Ỵỵ, plus the relevant stylistic alts (e.g. stylistic set 1, Rectangular Caps).
The new release also comes with a variable font that holds 33 font files from display to text. Name Sans is still a work in progress. If you are a type nerd and have’t licensed Name Sans yet, get it now before the price goes up in the next release.