iCloud and Apple ID Usernames
An iCloud username is the front of your Apple ID email. It has to be unique, and it is awkward to change later. SpinXO builds short, readable names you can check before you create the account.
What the name has to do
Use letters and numbers. Skip spaces, emoji, and symbols. A name you can say out loud is easier to type on a new device. 6 to 16 characters is the comfortable range.
Check it before you commit
Generate a few spellings here, then try the one you like in Apple's signup. If it is taken, change a word rather than adding a long number.