You can change the summoner name associated with your account by editing your profile (hover your name at the top-right and select Edit Profile) and changing the information under Summoner. You'll need to change and update your summoner name, then go through the verification process to verify your new account.
Let me know if you have any further questions!
Let me know if you have any further questions!
Thanks to Nyoike for the sig!
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Thanks!