Account name lost ?

Hello, I dident play for some years, and I can remember 3 of my accounts. But my main account I somehow forgot name for.
I remeber that I was on another site where I merged my accounts to one user, but dont remember that site.
Is there any other way to get hold on my last account name ?

You can try this:
https://realmserver.com/restricted/realm_accounts/recover_account_form