I have a lot of old names that are still popping up, and they just get in the way.
For example: I joined up with this site called 'Bestcrosswords' and I'm using "seatug" as my UN.
...but one day something went kablooey, and I wound up with the letter "S" in the UN window, as well as seatug. I even tried to re-type the "S" into seatug [ie - 2 seatugs], but it failed.
Check it out.
The same with long lost email addresses when you type-in a starting letter in 'TO:', as in Thunderbird.
All this is seaweed on your line. Time to clean the line.

