Usernames that are readable

I believe this moreso negatively effects the mods and admins than the userbase, but I understand that this can negatively effect you guys as well.

My idea is to have a rule that states that usernames must be able to be read and typed out on your standard English keyboard.
The reason for this being that it's near impossible to find a user who has their name in magical Character Map symbols or in another language like Russian. You just can't find them unless you speak that language, know their ID, or know exactly what symbols they used.

Example:
"Cat" would be okay
"Kat" would be okay
"кошка" would not be okay
"Čąŧ" would not be okay

BUT
if the person put the English, readable version somewhere in their name, that would be okay too, for example: "кошка (Kat)"
I have had to resort to searching the forums for any replies from other users to the unreadable usernames and it proves to be fruitless u__u