An error occurred while saving the commentLucas Callero commented
I don't even know the last name of most of my coworkers, it's not usual here in Brazil (and sometimes it's even disrespectful) to call someone by their last name. Also, there are people with SEVERAL last names and it's very common to see "last" names that could also be "first" names, making everything even more confuse!
ex: João Pedro Silva would show as "Pedro Silva, João".
At first sight you think "what? I don't know any Pedro in my organization... Oh, nevermind, it's just João". That happens EVERY single time for a few people, I have to memorize their second names... It's terrible.
PS: I had the same problem in Skype, but at least I could chose to display the "e-mails" instead of "names" in my contact list, it's not the best solution but it was much more useful than having my contacts list sorted by random "last" names.