In a few, very few, cases I think that people's online forum identity is closely related to specific in-game characters. And, in those cases I can understand that they would want to preserve the in-game character name across all servers.
However, it is clearly not beyond the pale that multiple people use the same character name in their PnP past (or present) and want to transfer that game identity to DDO. I found that with the name Geldor. I've been using that name since 1985 as a key NPC in D&D campaigns that I've run. Same with Ezra, Caleb and a dozen others. I had a player whose character was named Blodgett -- a great halfling name (can't recall if it was original or came from an old module).
I got into DDO within a few months of launch and
all of those names were already used. I've gotten most of them (missed Blodgett on Cannith and Orien) and not out of griefing anyone but because they are important to me in their own right.
I would never take Kargon (who I greatly miss), as an example, or any other forum name -- although some are really cool (and some are just as unimaginative as ASFYEARA which is just the random keys I typed at the moment). Luckily for me my character builds have sometimes been closer to infamous than famous so it is unlikely that I'll see Neebelnox on other servers or Leyoni. Imagine, however, my frustration when I was playing Cratesmasher on Ghallanda and found myself in a group with a player who said, "I have Cratesmasher on almost every other server." I logged out after the quest and checked, and they did. Seriously, who wants to be associated -- even by accident -- with a "gimp" ranger build that started with only 8 STR? I guess they did.
So, I understand the desire to have names across all servers but I also don't hold it against anyone that they happen to have a name that I would have wanted.
IMO that is the nice thing about both Cannith and Orien -- the chance to get the names you would have liked to have had on other servers but that were already being used.