Change icloud email account

Once an Apple ID is created the first and last name can't be changed , its permanent .

However an alias can be created for it Add and manage email aliases for iCloud Mail on iCloud.com - Apple Support

Note: You can’t delete or turn off a primary iCloud Mail address. You can’t use an alias to create a separate Apple ID, and an email alias can’t be converted to a primary iCloud Mail address.

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