No offense, but less than 1% of the population has an interesting, clever, or powerful sounding name. This is virtually unattainable when requiring surnames.
I believe the only reason for surnames was because of the drama that occurs 8 years down the road when you have to merge servers...
Surnames should not exist in FFXIV. Not only do most people's names suck, but it makes the game look like a text-adventure in crowded zones.
I won't even bring up the fact that trying to send a /tell to Whargershire Alizeilaronetsunakashima as he runs across the screen is often a disaster.
If you are in defense of surnames, please know that your name sucks and is not memorable to anyone other than yourself (unless you're Belgian, Rofl, that is...)
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EDIT: The solution we have all agreed upon is to make surnames optional. Those people who don't care about having a name that sucks can keep their surnames. Those of us who want to be seen with only a nickname will be satisfied as well. Yoshi-P! Fix this right away!