Type the first couple of letters in the username box: wait 15-seconds and the box will magically appear with usernames starting with that letter combination
If the username is still not there, type in another letter and wait. Usernames are case, punctuation, and space sensitive, so if a username is CamelCased, has punctuation, or has spaces, you will have to try those variations too.
If you have ever conversed with them, you could check the histories of your own talk page and talk page archives. Set your view to (500).
In your contributions, you could limit the namespace to user talk, and that would give you the names of all the users you have posted to on their talk pages. The same with the talk namespace (via your contributions).
You could also search the talk namespace for your own signature, to locate the threads where others may have replied to you
Where do they hang out? What are they renowned for? If you can remember where they have posted messages, then you can find their username.
Users Search box for users by name or official capacity
Wikimedia FoundationThis is a Wikipedia user page. This is not an encyclopedia article! If you find this page on any site other than Wikipedia, you are viewing a mirror site. Be aware that the page may be outdated and that the user this page belongs to most likely has no personal affiliation whatsoever with any other Wikipedia based site other than Wikipedia itself.
License
I agree to multi-license my text contributions, unless otherwise stated, under the GFDL and the Creative Commons Attribution Share-Alike license version 1.0 and version 2.0. Please be aware that other contributors might not do the same, so if you want to use my contributions under the Creative Commons terms, please check the CC dual-license and Multi-licensing guides.
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