I do remember one person's username, but she had 3 numbers at the end, and I really can't remember those either. And I just tried a lot of websites, with and without those 3 numbers, and none of them could find anything.
It would really help if there was a server database that searched for only the things that I specified. Because every website I tried, searches for every server that has what I filtered. Let's say I filter "McMMO" on a search website, it will show me every server with that plugin, not servers that have only that plugin and nothing else.