Why the odd user names?

In the last several months, odd looking usernames have been cropping up on the Forum. The usernames have a first half that looks "normal" but then have a random character string for the second half.
At first I thought they were spam names, then saw that they were being accepted. I cannot see why someone would decide to have a username like chadpeterson32xxq&£%#17, it must be inconvenient for the user to have to remember and to type. So what is going on?
Not a vital question, just curious.
I chose my username many years ago, when I thought a username was the name that I used, hence steve_sordy. So I'm not hard to find.
At first I thought they were spam names, then saw that they were being accepted. I cannot see why someone would decide to have a username like chadpeterson32xxq&£%#17, it must be inconvenient for the user to have to remember and to type. So what is going on?
Not a vital question, just curious.

I chose my username many years ago, when I thought a username was the name that I used, hence steve_sordy. So I'm not hard to find.
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Someone on the Bike Radar team will know for sure.
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2016 Voodoo Wazoo
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This is not the question of the age, and I have already spent more time on this than I ever thought I would.
I agree that "sordy" is indeed an odd name. If you know anyone with that surname then they are a relative of mine for certain. It is an anglicised version of "sordi" which is quite common in parts of Italy. It first appeared in the UK in Northumberland in the 1700's.
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