Can I change my name

Here. Remember that you can do it only once a year, so make sure you get the nick you want and won't regret it.

You can change your username once every year.
Which means... you have one year to go.

Real grill?! PogChamp

Hmm, how about "Thestaticpanda4"? Oh, I guess that one was taken...

Click where it says "Account" in the top right corner. Under "2. Username", enter the new name. However, you can do so only once a year and since you just registered, you are going to have to wait a year.

Or, you can contact SteamGifts support and ask them to change it. Not sure, if they would do it.

How about "RARPi"? Oh, I guess that one is a giveaway.