Can i change my username or make a new one and transfer my inventory?!

[bee Baroque 161]

not possible to change username and any inventory you wish to transfer to any other account you would have to transfer yourself (and no, no transfer inventory cannot be transferred).

[bee Baroque 161]

not possible to change username and any inventory you wish to transfer to any other account you would have to transfer yourself (and no, no transfer inventory cannot be transferred).

[Peewee Musytari 731]

You can just use a Display Name instead.

http://community.secondlife.com/t5/English-Knowledge-Base/Display-names/ta-p/700173

[Storm Clarence 495]

If you have not invested too much into your current avatar e.g., clothing, skins, etc.  you may want to consider creating an alternate avatar.  Go to secondlife.com and click on join.  Create a new name for your new avatar.  You can now use either avatar in-world.  

[Venus Petrov 334]

While you cannot change your name, you CAN create a Display Name.  Whatever display name you choose, you must keep for at least one week.  Or, you can keep it as long as you like.  In most viewers, the display name will show over your avatar instead of the name you originally selected.

Unfortunately, LL is not in the business of transfering inventory items from one avatar to another, even if it is your alt.

Here is information on how to create a display name. Good luck!