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Longman Dictionary of Contemporary English
user name
noun
EXAMPLES FROM CORPUS
▪ Note that on all subsequent pages, the supplied user name will be displayed at the top of the page.
▪ The user name can be up to 28 alphanumeric characters long including spaces.
▪ You gain access to your data by typing in a user name and password.
Wiktionary
user name

n. (alternative spelling of username English)

Usage examples of "user name".

I'd say there are at last five different people here, all with access to the same user name.

It seemed likely, I decided, that the person who got into the OCME data base knew enough about it to realize he could create a new password for the user name found in the Public.

Then he logged off, and logged on again using the user name ‘.

Though anyone could change to my directory, unless he logged in with my user name and password, he should not be able to list the files in Chief or read them.

Even if I booted up with Stephen Lime's user name and passw'ord, I couldn't get into the general system.

If your machine is on the Internet, you can log onto other computers, provided you have a user name and a password.

You just dial a local phone number that hooks you to the system, then type in your user name and password.