Okay, I had this problem with my G6 and lollipop and hoped Samsung/android would be better with a new G7 and marshmallow but it isn't. I want my contacts to be displayed and sorted last name first. They look good in contacts and also when I view contacts while texting but not from within creating email. When I view contacts from within email they are first name first. I'm using the native apps that come with android for all this. I have no idea of how to fix this, but it seems I'm doomed to have it this way. I'm pretty sure it wasn't like this with key lime pie but I no longer remember. Is there some way to fix the display order in email?