Yes, you can easily change your login e-mail and name following this URL https://ahrefs.com/account/my-account :
Please, keep in mind that this will only change your Ahrefs login. If you need to update your e-mail for billing notifications or if you need it to be a different e-mail, please, contact our support team to assist you further.
Related:
How can I update my personal particulars within Ahrefs' interface?
How to update payment info if subscription has ceased due to failed payment?