Search for user names containing a particular pattern (a string, though I suppose you can add some SQL magic there if you know how).
Q&A for gardeners and landscapers
SELECT Id AS [User Link], Reputation, UpVotes, DownVotes, CreationDate, LastAccessDate, WebsiteUrl, Location FROM Users WHERE DisplayName LIKE '##Characters##%'; -- Characters: Character(s) that a displayname should start with: