In Elgg 1.5 you can't change the username because it's tied to the data directory.

In any Elgg version, you can't hide the username from the URL because it's how Elgg knows which profile, blogs, etc to show.

If you want absolute privacy, the best option is to install the Walled Garden plugin.

One option is to assign a random username to every user and have them login with their email address.

@Alpha, another solution is to create a module which overrides the user register action and change the  username to some unique md5 code. and let the user login by email as Cash said.

Regards
Team Webgalli
http://webgalli.com

Thanks guys for your input!

The members of this community benefit greatly from your talent!

Is there already a solution? Or is there a possibility to hide "name" and let "username". sorry for my english :D. Thx!

There is no solution still available publicly. You need to use the same solution explained above.